diff --git a/README.md b/README.md
index 03e67a4..9fda76d 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@ Utilizes an extensible adapter pattern to easily integrate various storage types
 | Category | Adapters |
 |---|---|
 | **Standard Protocols** | Local, S3-compatible, WebDAV, SFTP, FTP |
-| **Cloud Drives** | Google Drive, OneDrive, Dropbox, Quark, UC |
+| **Cloud Drives** | Google Drive, OneDrive, Dropbox, Quark, UC, 123Pan |
 | **Special** | Telegram, AList, Foxel-to-Foxel |
 
 ### 🔍 AI-Powered Semantic Search
diff --git a/README_zh.md b/README_zh.md
index a6ed92b..455613c 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -40,7 +40,7 @@
 | 分类 | 适配器 |
 |---|---|
 | **标准协议** | 本地存储、S3 兼容存储、WebDAV、SFTP、FTP |
-| **网盘服务** | Google Drive、OneDrive、Dropbox、夸克网盘、UC 网盘 |
+| **网盘服务** | Google Drive、OneDrive、Dropbox、夸克网盘、UC 网盘、123 网盘 |
 | **特殊类型** | Telegram、AList、Foxel 互联 |
 
 ### 🔍 AI 语义搜索
diff --git a/domain/adapters/providers/_remote.py b/domain/adapters/providers/_remote.py
new file mode 100644
index 0000000..1608c7f
--- /dev/null
+++ b/domain/adapters/providers/_remote.py
@@ -0,0 +1,208 @@
+import asyncio
+import mimetypes
+import posixpath
+import tempfile
+from datetime import datetime, timezone
+from urllib.parse import urlsplit
+
+import httpx
+from fastapi import HTTPException
+from fastapi.responses import StreamingResponse
+from starlette.background import BackgroundTask
+
+
+def clean_path(path):
+    parts = str(path or "").replace("\\", "/").split("/")
+    if any(part in ("..", ".") for part in parts):
+        raise ValueError("Relative path components are not allowed")
+    return "/".join(part for part in parts if part)
+
+
+def join_path(root, rel):
+    return "/" + "/".join(filter(None, (clean_path(root), clean_path(rel))))
+
+
+def timestamp(value):
+    if isinstance(value, (int, float)):
+        return int(value / 1000 if value > 10**11 else value)
+    if not value:
+        return 0
+    try:
+        return int(value)
+    except (ValueError, TypeError):
+        try:
+            date = datetime.fromisoformat(str(value).replace("Z", "+00:00"))
+            return int(date.replace(tzinfo=date.tzinfo or timezone.utc).timestamp())
+        except ValueError:
+            return 0
+
+
+def entry(name, is_dir, size=0, mtime=0, **extra):
+    return {"name": name, "is_dir": bool(is_dir), "type": "dir" if is_dir else "file",
+            "size": 0 if is_dir else int(size or 0), "mtime": timestamp(mtime), **extra}
+
+
+def paginate(items, page_num, page_size, sort_by, sort_order):
+    field = sort_by if sort_by in ("name", "size", "mtime") else "name"
+    items = sorted(items, key=lambda item: str(item["name"]).casefold() if field == "name" else item[field],
+                   reverse=sort_order.lower() == "desc")
+    items.sort(key=lambda item: not item["is_dir"])
+    start = (max(1, page_num) - 1) * max(1, page_size)
+    return items[start:start + max(1, page_size)], len(items)
+
+
+class RemoteFileAdapter:
+    def _client(self, **kwargs):
+        return httpx.AsyncClient(timeout=getattr(self, "timeout", 60), **kwargs)
+
+    async def _download(self, root, rel):
+        raise NotImplementedError
+
+    async def read_file(self, root, rel):
+        url, headers = await self._download(root, rel)
+        async with self._client(follow_redirects=True) as client:
+            response = await client.get(url, headers=headers)
+            if response.status_code == 404:
+                raise FileNotFoundError(rel)
+            response.raise_for_status()
+            return response.content
+
+    async def stream_file(self, root, rel, range_header):
+        url, headers = await self._download(root, rel)
+        if urlsplit(url).scheme not in ("https", "http"):
+            raise HTTPException(502, "Invalid download URL")
+        headers = {**headers, "Accept-Encoding": "identity"}
+        if range_header:
+            headers["Range"] = range_header
+        client = self._client(follow_redirects=True)
+        response = None
+
+        async def close():
+            if response is not None:
+                await response.aclose()
+            await client.aclose()
+
+        try:
+            response = await client.send(client.build_request("GET", url, headers=headers), stream=True)
+            if response.status_code == 416:
+                raise HTTPException(416, "Range not satisfiable", headers={
+                    "Content-Range": response.headers.get("content-range", "bytes */*")})
+            if response.status_code == 404:
+                raise FileNotFoundError(rel)
+            response.raise_for_status()
+        except BaseException:
+            await close()
+            raise
+
+        async def body():
+            try:
+                async for chunk in response.aiter_raw():
+                    yield chunk
+            finally:
+                await close()
+
+        forwarded = {key: response.headers[key] for key in
+                     ("content-length", "content-range", "accept-ranges", "etag", "last-modified")
+                     if key in response.headers}
+        return StreamingResponse(body(), status_code=response.status_code, headers=forwarded,
+                                 media_type=response.headers.get("content-type") or
+                                 mimetypes.guess_type(rel)[0] or "application/octet-stream",
+                                 background=BackgroundTask(close))
+
+    async def write_file(self, root, rel, data):
+        async def chunks():
+            yield data
+        return await self.write_file_stream(root, rel, chunks())
+
+    async def write_file_stream(self, root, rel, data_iter):
+        with tempfile.TemporaryFile() as file:
+            size = 0
+            async for chunk in data_iter:
+                if chunk:
+                    await asyncio.to_thread(file.write, chunk)
+                    size += len(chunk)
+            file.seek(0)
+            await self.write_upload_file(root, rel, file, posixpath.basename(rel), size)
+            return size
+
+    async def exists(self, root, rel):
+        try:
+            await self.stat_file(root, rel)
+            return True
+        except FileNotFoundError:
+            return False
+
+    async def stat_path(self, root, rel):
+        try:
+            return {**await self.stat_file(root, rel), "exists": True, "path": rel}
+        except FileNotFoundError:
+            return {"exists": False, "is_dir": None, "path": rel}
+
+    async def rename(self, root, src_rel, dst_rel):
+        return await self.move(root, src_rel, dst_rel)
+
+    async def copy(self, root, src_rel, dst_rel, overwrite=False):
+        src_rel, dst_rel = clean_path(src_rel), clean_path(dst_rel)
+        if not src_rel or not dst_rel or dst_rel == src_rel or dst_rel.startswith(src_rel + "/"):
+            raise ValueError("Invalid copy destination")
+        item = await self.stat_file(root, src_rel)
+        if await self.exists(root, dst_rel):
+            if not overwrite:
+                raise FileExistsError(dst_rel)
+            await self.delete(root, dst_rel)
+        if item["is_dir"]:
+            await self.mkdir(root, dst_rel)
+            page = 1
+            while True:
+                children, total = await self.list_dir(root, src_rel, page, 100)
+                for child in children:
+                    await self.copy(root, src_rel + "/" + child["name"], dst_rel + "/" + child["name"])
+                if page * 100 >= total:
+                    break
+                page += 1
+        else:
+            response = await self.stream_file(root, src_rel, None)
+            try:
+                await self.write_file_stream(root, dst_rel, response.body_iterator)
+            finally:
+                await response.body_iterator.aclose()
+                if response.background:
+                    await response.background()
+
+
+class IDFileAdapter(RemoteFileAdapter):
+    def get_effective_root(self, sub_path):
+        return "/".join(filter(None, (str(self.root_id), clean_path(sub_path))))
+
+    async def _resolve(self, root, rel):
+        base, _, sub_path = (root or str(self.root_id)).partition("/")
+        current = entry("", True, id=base)
+        for name in clean_path(join_path(sub_path, rel)).split("/"):
+            if not name:
+                continue
+            if not current["is_dir"]:
+                raise NotADirectoryError(name)
+            children = await self._children(current["id"])
+            current = next((child for child in children if child["name"] == name), None)
+            if current is None:
+                raise FileNotFoundError(rel)
+        return current
+
+    async def _parent(self, root, rel):
+        path = clean_path(rel)
+        if not path:
+            raise ValueError("Cannot modify mount root")
+        parent, name = posixpath.split(path)
+        folder = await self._resolve(root, parent)
+        if not folder["is_dir"]:
+            raise NotADirectoryError(parent)
+        return folder, name
+
+    async def stat_file(self, root, rel):
+        return await self._resolve(root, rel)
+
+    async def list_dir(self, root, rel, page_num=1, page_size=50, sort_by="name", sort_order="asc"):
+        folder = await self._resolve(root, rel)
+        if not folder["is_dir"]:
+            raise NotADirectoryError(rel)
+        return paginate(await self._children(folder["id"]), page_num, page_size, sort_by, sort_order)
diff --git a/domain/adapters/providers/pan123.py b/domain/adapters/providers/pan123.py
new file mode 100644
index 0000000..b413edc
--- /dev/null
+++ b/domain/adapters/providers/pan123.py
@@ -0,0 +1,214 @@
+import asyncio
+import base64
+import hashlib
+import secrets
+import time
+import zlib
+from datetime import datetime, timezone, timedelta
+from urllib.parse import parse_qs, urlsplit
+
+import aioboto3
+from botocore.config import Config
+from fastapi import HTTPException
+
+from ._remote import IDFileAdapter, clean_path, entry
+
+
+class Pan123Adapter(IDFileAdapter):
+    api_base = "https://yun.123pan.com/b/api"
+    part_size = 16 * 1024 * 1024
+
+    def __init__(self, record):
+        self.record = record
+        cfg = record.config or {}
+        self.username = cfg.get("username")
+        self.password = cfg.get("password")
+        self.root_id = str(cfg.get("root_id", "0"))
+        self.timeout = float(cfg.get("timeout", 60))
+        if not self.username or not self.password:
+            raise ValueError("123Pan requires username and password")
+        self._token = None
+        self._login_lock = asyncio.Lock()
+
+    def _headers(self):
+        return {"Origin": "https://yun.123pan.com", "Referer": "https://yun.123pan.com/",
+                "User-Agent": "Mozilla/5.0", "platform": "web", "app-version": "3"}
+
+    async def _login(self):
+        async with self._login_lock:
+            if self._token:
+                return
+            payload = {"mail": self.username, "password": self.password, "type": 2} if "@" in self.username else {
+                "passport": self.username, "password": self.password, "remember": True}
+            async with self._client() as client:
+                response = await client.post("https://login.123pan.com/api/user/sign_in",
+                                             headers=self._headers(), json=payload)
+                response.raise_for_status()
+                data = response.json()
+            if data.get("code") != 200 or not (data.get("data") or {}).get("token"):
+                raise HTTPException(502, "123Pan login failed; check credentials or complete account verification")
+            self._token = data["data"]["token"]
+
+    @staticmethod
+    def _signature(path):
+        # The web API signs the request path and a timestamp, not the account credentials.
+        now = int(time.time())
+        digits = datetime.fromtimestamp(now, timezone(timedelta(hours=8))).strftime("%Y%m%d%H%M")
+        encoded = digits.translate(str.maketrans("0123456789", "adefghlmyi"))
+        key = str(zlib.crc32(encoded.encode()))
+        nonce = str(secrets.randbelow(10**7))
+        checksum = zlib.crc32(f"{now}|{nonce}|{path}|web|3|{key}".encode())
+        return {key: f"{now}-{nonce}-{checksum}"}
+
+    async def _api(self, method, path, *, params=None, json=None):
+        for attempt in range(2):
+            await self._login()
+            url = self.api_base + path
+            async with self._client() as client:
+                response = await client.request(method, url, json=json,
+                    params={**(params or {}), **self._signature(urlsplit(url).path)},
+                    headers={**self._headers(), "Authorization": "Bearer " + self._token})
+                if response.status_code == 401 and attempt == 0:
+                    self._token = None
+                    continue
+                response.raise_for_status()
+                payload = response.json()
+            code = payload.get("code")
+            if code == 401 and attempt == 0:
+                self._token = None
+                continue
+            if code != 0:
+                raise HTTPException(502, f"123Pan API failed (code={code})")
+            return payload.get("data") or {}
+        raise HTTPException(502, "123Pan authentication expired")
+
+    async def _children(self, parent_id):
+        items, page = [], 1
+        while True:
+            result = await self._api("GET", "/file/list/new", params={
+                "parentFileId": parent_id, "driveId": 0, "limit": 100, "Page": page,
+                "next": 0, "trashed": "false", "orderBy": "file_id", "orderDirection": "desc",
+                "SearchData": "", "OnlyLookAbnormalFile": 0, "event": "homeListFile",
+                "operateType": 4, "inDirectSpace": "false"})
+            batch = result.get("InfoList") or []
+            items.extend(entry(f["FileName"], f["Type"] == 1, f.get("Size"), f.get("UpdateAt"),
+                               id=str(f["FileId"]), raw=f) for f in batch)
+            if not batch or str(result.get("Next")) == "-1" or len(items) >= int(result.get("Total", len(items))):
+                return items
+            page += 1
+
+    async def _download(self, root, rel):
+        item = await self._resolve(root, rel)
+        if item["is_dir"]:
+            raise IsADirectoryError(rel)
+        f = item["raw"]
+        result = await self._api("POST", "/file/download_info", json={
+            "driveId": 0, "fileId": f["FileId"], "fileName": f["FileName"], "size": f["Size"],
+            "etag": f.get("Etag", ""), "s3keyFlag": f.get("S3KeyFlag", ""), "type": 0})
+        url = result.get("DownloadUrl", "")
+        encoded = parse_qs(urlsplit(url).query).get("params")
+        if encoded:
+            url = base64.b64decode(encoded[0]).decode()
+        if urlsplit(url).scheme not in ("https", "http"):
+            raise HTTPException(502, "123Pan returned no download URL")
+        async with self._client(follow_redirects=False) as client:
+            response = await client.send(client.build_request("GET", url, headers={"Referer": "https://yun.123pan.com/"}), stream=True)
+            try:
+                if response.is_redirect:
+                    url = str(response.url.join(response.headers["location"]))
+                elif "application/json" in response.headers.get("content-type", ""):
+                    await response.aread()
+                    url = (response.json().get("data") or {}).get("redirect_url", "")
+                else:
+                    response.raise_for_status()
+            finally:
+                await response.aclose()
+        if not url:
+            raise HTTPException(502, "123Pan returned no download URL")
+        return url, {"Referer": "https://yun.123pan.com/"}
+
+    async def mkdir(self, root, rel):
+        parent, name = await self._parent(root, rel)
+        await self._api("POST", "/file/upload_request", json={"driveId": 0, "etag": "", "fileName": name,
+            "parentFileId": int(parent["id"]), "size": 0, "type": 1})
+
+    async def delete(self, root, rel):
+        await self._parent(root, rel)
+        item = await self._resolve(root, rel)
+        await self._api("POST", "/file/trash", json={"driveId": 0, "operation": True,
+                                                    "fileTrashInfoList": [item["raw"]]})
+
+    async def move(self, root, src_rel, dst_rel):
+        src_rel, dst_rel = clean_path(src_rel), clean_path(dst_rel)
+        if not src_rel or not dst_rel or dst_rel.startswith(src_rel + "/"):
+            raise ValueError("Invalid move destination")
+        if src_rel == dst_rel:
+            return
+        src_parent, _ = await self._parent(root, src_rel)
+        item = await self._resolve(root, src_rel)
+        parent, name = await self._parent(root, dst_rel)
+        if await self.exists(root, dst_rel):
+            raise FileExistsError(dst_rel)
+        if parent["id"] != src_parent["id"]:
+            await self._api("POST", "/file/mod_pid", json={"fileIdList": [{"FileId": int(item["id"])}],
+                                                         "parentFileId": int(parent["id"])})
+        if name != item["name"]:
+            await self._api("POST", "/file/rename", json={"driveId": 0, "fileId": int(item["id"]), "fileName": name})
+
+    async def write_upload_file(self, root, rel, file_obj, filename=None, file_size=None, content_type=None):
+        parent, name = await self._parent(root, rel)
+        def measure():
+            file_obj.seek(0)
+            digest, size = hashlib.md5(), 0
+            while chunk := file_obj.read(1024 * 1024):
+                digest.update(chunk)
+                size += len(chunk)
+            file_obj.seek(0)
+            return digest.hexdigest(), size
+        md5, size = await asyncio.to_thread(measure)
+        upload = await self._api("POST", "/file/upload_request", json={
+            "driveId": 0, "duplicate": 2, "etag": md5, "fileName": name,
+            "parentFileId": int(parent["id"]), "size": size, "type": 0})
+        if upload.get("Reuse"):
+            return {"size": size}
+        if not upload.get("Key"):
+            raise HTTPException(502, "123Pan returned incomplete upload information")
+        if upload.get("AccessKeyId"):
+            async with aioboto3.Session().client("s3", endpoint_url=upload["EndPoint"], region_name="123pan",
+                aws_access_key_id=upload["AccessKeyId"], aws_secret_access_key=upload["SecretAccessKey"],
+                aws_session_token=upload["SessionToken"], config=Config(s3={"addressing_style": "path"})) as client:
+                await client.upload_fileobj(file_obj, upload["Bucket"], upload["Key"])
+            await self._api("POST", "/file/upload_complete", json={"fileId": upload["FileId"]})
+        else:
+            count = max(1, (size + self.part_size - 1) // self.part_size)
+            async with self._client() as client:
+                for number in range(1, count + 1):
+                    signed = await self._api("POST", "/file/s3_repare_upload_parts_batch" if count > 1 else "/file/s3_upload_object/auth",
+                        json={"StorageNode": upload["StorageNode"], "bucket": upload["Bucket"], "key": upload["Key"],
+                              "uploadId": upload["UploadId"], "partNumberStart": number, "partNumberEnd": number + 1})
+                    url = (signed.get("presignedUrls") or {}).get(str(number))
+                    if not url:
+                        raise HTTPException(502, "123Pan returned no upload URL")
+                    response = await client.put(url, content=await asyncio.to_thread(file_obj.read, self.part_size))
+                    response.raise_for_status()
+            await self._api("POST", "/file/upload_complete/v2", json={
+                "StorageNode": upload["StorageNode"], "bucket": upload["Bucket"], "key": upload["Key"],
+                "uploadId": upload["UploadId"], "fileId": upload["FileId"], "fileSize": size, "isMultipart": count > 1})
+        return {"size": size}
+
+    async def get_usage(self, root):
+        data = await self._api("GET", "/user/info")
+        used = int(data["SpaceUsed"])
+        total = int(data.get("SpacePermanent", 0)) + int(data.get("SpaceTemp", 0))
+        return {"used_bytes": used, "total_bytes": total, "free_bytes": total - used,
+                "scope": "account", "source": "pan123"}
+
+
+ADAPTER_TYPE = "pan123"
+ADAPTER_FACTORY = Pan123Adapter
+CONFIG_SCHEMA = [
+    {"key": "username", "label": "Username", "type": "string", "required": True},
+    {"key": "password", "label": "Password", "type": "password", "required": True},
+    {"key": "root_id", "label": "Root ID", "type": "string", "default": "0"},
+    {"key": "timeout", "label": "Timeout (seconds)", "type": "number", "default": 60},
+]
diff --git a/tests/test_pan123_adapter.py b/tests/test_pan123_adapter.py
new file mode 100644
index 0000000..3969789
--- /dev/null
+++ b/tests/test_pan123_adapter.py
@@ -0,0 +1,101 @@
+import json
+import io
+from types import SimpleNamespace
+import unittest
+
+import httpx
+
+from domain.adapters.providers.pan123 import Pan123Adapter
+
+
+class Pan123AdapterTests(unittest.IsolatedAsyncioTestCase):
+    def make_adapter(self, handler):
+        adapter = Pan123Adapter(SimpleNamespace(config={"username": "user", "password": "password"}))
+        adapter._client = lambda **kwargs: httpx.AsyncClient(transport=httpx.MockTransport(handler), **kwargs)
+        return adapter
+
+    async def test_login_retry_and_subdirectory_resolution(self):
+        logins, lists = [], []
+
+        def handler(request):
+            if request.url.host == "login.123pan.com":
+                logins.append(json.loads(request.content))
+                return httpx.Response(200, json={"code": 200, "data": {"token": f"token{len(logins)}"}})
+            self.assertTrue(any("-" in value for value in request.url.params.values()))
+            self.assertEqual(request.headers["platform"], "web")
+            parent = request.url.params["parentFileId"]
+            lists.append(parent)
+            if len(lists) == 1:
+                return httpx.Response(200, json={"code": 401})
+            item = {"FileName": "folder" if parent == "0" else "file.txt",
+                    "FileId": 1 if parent == "0" else 2, "Type": 1 if parent == "0" else 0, "Size": 5}
+            return httpx.Response(200, json={"code": 0, "data": {"InfoList": [item], "Total": 1}})
+
+        adapter = self.make_adapter(handler)
+        items, total = await adapter.list_dir(adapter.get_effective_root("folder"), "")
+        self.assertEqual(total, 1)
+        self.assertEqual(items[0]["name"], "file.txt")
+        self.assertEqual(len(logins), 2)
+        self.assertEqual(logins[0]["passport"], "user")
+        self.assertEqual(lists, ["0", "0", "1"])
+
+    async def test_multipart_upload_order_and_finalize(self):
+        calls, uploaded = [], []
+
+        def handler(request):
+            if request.url.host == "upload.test":
+                uploaded.append(request.content)
+                return httpx.Response(200)
+            body = json.loads(request.content) if request.content else {}
+            calls.append((request.url.path, body))
+            if request.url.path.endswith("upload_request"):
+                self.assertEqual(body["etag"], "e80b5017098950fc58aad83c8c14978e")
+                result = {"Key": "key", "StorageNode": "node", "Bucket": "bucket", "UploadId": "upload", "FileId": 1}
+            elif request.url.path.endswith("s3_repare_upload_parts_batch"):
+                n = body["partNumberStart"]
+                self.assertEqual(body["partNumberEnd"], n + 1)
+                result = {"presignedUrls": {str(n): f"https://upload.test/{n}"}}
+            else:
+                result = {}
+            return httpx.Response(200, json={"code": 0, "data": result})
+
+        adapter = self.make_adapter(handler)
+        adapter._token = "token"
+        adapter.part_size = 2
+        result = await adapter.write_upload_file("0", "file", io.BytesIO(b"abcdef"))
+        self.assertEqual(result, {"size": 6})
+        self.assertEqual(uploaded, [b"ab", b"cd", b"ef"])
+        self.assertEqual(calls[-1][0], "/b/api/file/upload_complete/v2")
+        self.assertTrue(calls[-1][1]["isMultipart"])
+
+    async def test_failed_part_does_not_finalize(self):
+        finalized = []
+
+        def handler(request):
+            if request.url.host == "upload.test":
+                return httpx.Response(500)
+            if request.url.path.endswith("upload_request"):
+                data = {"Key": "key", "StorageNode": "node", "Bucket": "bucket", "UploadId": "upload", "FileId": 1}
+            elif request.url.path.endswith("auth"):
+                data = {"presignedUrls": {"1": "https://upload.test/1"}}
+            else:
+                finalized.append(request.url.path)
+                data = {}
+            return httpx.Response(200, json={"code": 0, "data": data})
+
+        adapter = self.make_adapter(handler)
+        adapter._token = "token"
+        with self.assertRaises(httpx.HTTPStatusError):
+            await adapter.write_upload_file("0", "file", io.BytesIO(b"a"))
+        self.assertFalse(finalized)
+
+    async def test_root_escape_is_rejected(self):
+        adapter = self.make_adapter(lambda request: self.fail("Unexpected request"))
+        with self.assertRaises(ValueError):
+            await adapter.stat_file("0", "../other")
+
+    async def test_invalid_move_is_rejected_before_network_calls(self):
+        adapter = self.make_adapter(lambda request: self.fail("Unexpected request"))
+        with self.assertRaises(ValueError):
+            await adapter.move("0", "dir", "dir/subdir")
+        await adapter.move("0", "dir", "dir")
diff --git a/tests/test_remote_adapter.py b/tests/test_remote_adapter.py
new file mode 100644
index 0000000..c577f09
--- /dev/null
+++ b/tests/test_remote_adapter.py
@@ -0,0 +1,60 @@
+import unittest
+
+import httpx
+from fastapi import HTTPException
+
+from domain.adapters.providers._remote import RemoteFileAdapter, join_path, paginate
+
+
+class DownloadAdapter(RemoteFileAdapter):
+    async def _download(self, root, rel):
+        return "https://download.test/file", {"Cookie": "session=test"}
+
+
+class RemoteAdapterTests(unittest.IsolatedAsyncioTestCase):
+    async def test_range_response_and_connection_cleanup(self):
+        clients = []
+
+        class Body(httpx.AsyncByteStream):
+            closed = False
+
+            async def __aiter__(self):
+                yield b"ab"
+
+            async def aclose(self):
+                self.closed = True
+
+        body = Body()
+        def handler(request):
+            self.assertEqual(request.headers["Range"], "bytes=1-2")
+            return httpx.Response(206, headers={"Content-Range": "bytes 1-2/4", "Content-Length": "2"}, stream=body)
+
+        adapter = DownloadAdapter()
+        def client(**kwargs):
+            instance = httpx.AsyncClient(transport=httpx.MockTransport(handler), **kwargs)
+            clients.append(instance)
+            return instance
+        adapter._client = client
+        response = await adapter.stream_file("/", "file", "bytes=1-2")
+        self.assertFalse(clients[0].is_closed)
+        self.assertEqual(response.status_code, 206)
+        self.assertEqual(response.headers["content-range"], "bytes 1-2/4")
+        self.assertEqual(b"".join([part async for part in response.body_iterator]), b"ab")
+        self.assertTrue(clients[0].is_closed)
+        self.assertTrue(body.closed)
+
+    async def test_unsatisfiable_range(self):
+        adapter = DownloadAdapter()
+        adapter._client = lambda **kwargs: httpx.AsyncClient(transport=httpx.MockTransport(
+            lambda request: httpx.Response(416, headers={"Content-Range": "bytes */4"})), **kwargs)
+        with self.assertRaises(HTTPException) as caught:
+            await adapter.stream_file("/", "file", "bytes=8-")
+        self.assertEqual(caught.exception.status_code, 416)
+
+    def test_paths_and_directories_first_in_descending_order(self):
+        self.assertEqual(join_path("/root", "sub/file"), "/root/sub/file")
+        with self.assertRaises(ValueError):
+            join_path("/root", "../file")
+        items, total = paginate([{"name": "file", "is_dir": False}, {"name": "dir", "is_dir": True}], 1, 10, "name", "desc")
+        self.assertEqual(total, 2)
+        self.assertTrue(items[0]["is_dir"])
diff --git a/web/src/i18n/locales/en.json b/web/src/i18n/locales/en.json
index 3a773c7..863fbae 100644
--- a/web/src/i18n/locales/en.json
+++ b/web/src/i18n/locales/en.json
@@ -591,6 +591,7 @@
   "adapter.type.telegram": "Telegram",
   "adapter.type.quark": "Quark Drive",
   "adapter.type.uc": "UC Drive",
+  "adapter.type.pan123": "123Pan (Account)",
   "adapter.type.alist": "AList",
   "adapter.type.openlist": "OpenList",
   "Automation Tasks": "Automation Tasks",
diff --git a/web/src/i18n/locales/zh.json b/web/src/i18n/locales/zh.json
index f2ec358..0fd72c8 100644
--- a/web/src/i18n/locales/zh.json
+++ b/web/src/i18n/locales/zh.json
@@ -582,6 +582,7 @@
   "adapter.type.dropbox": "Dropbox",
   "adapter.type.quark": "夸克网盘",
   "adapter.type.uc": "UC 网盘",
+  "adapter.type.pan123": "123 网盘（账号）",
   "adapter.type.alist": "AList",
   "adapter.type.openlist": "OpenList",
   "Automation Tasks": "自动化任务",