fix: 回退 chanfana 到 v2，v3 有 breaking changes

chanfana 3.0.0 导致 OpenAPI 端点报错：
TypeError Cannot read properties of undefined (reading 'parent')

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package.json

@@ -6,7 +6,7 @@
     "cf-typegen": "wrangler types --include-env=false"
   },
   "dependencies": {
-    "chanfana": "^3.0.0",
+    "chanfana": "^2.8.3",
     "hono": "^4.11.7",
     "zod": "^3.25.76"
   },

pnpm-lock.yaml

@@ -9,8 +9,8 @@ importers:
   .:
     dependencies:
       chanfana:
-        specifier: ^3.0.0
-        version: 3.0.0
+        specifier: ^2.8.3
+        version: 2.8.3
       hono:
         specifier: ^4.11.7
         version: 4.11.7
@@ -24,10 +24,10 @@ importers:
 
 packages:
 
-  '@asteasolutions/zod-to-openapi@8.4.0':
-    resolution: {integrity: sha512-Ckp971tmTw4pnv+o7iK85ldBHBKk6gxMaoNyLn3c2Th/fKoTG8G3jdYuOanpdGqwlDB0z01FOjry2d32lfTqrA==}
+  '@asteasolutions/zod-to-openapi@7.3.4':
+    resolution: {integrity: sha512-/2rThQ5zPi9OzVwes6U7lK1+Yvug0iXu25olp7S0XsYmOqnyMfxH7gdSQjn/+DSOHRg7wnotwGJSyL+fBKdnEA==}
     peerDependencies:
-      zod: ^4.0.0
+      zod: ^3.20.2
 
   '@cloudflare/kv-asset-handler@0.4.2':
     resolution: {integrity: sha512-SIOD2DxrRRwQ+jgzlXCqoEFiKOFqaPjhnNTGKXSRLvp1HiOvapLaFG2kEr9dYQTYe8rKrd9uvDUzmAITeNyaHQ==}
@@ -404,8 +404,8 @@ packages:
   blake3-wasm@2.1.5:
     resolution: {integrity: sha512-F1+K8EbfOZE49dtoPtmxUQrpXaBIl3ICvasLh+nJta0xkz+9kF/7uet9fLnwKqhDrmj6g+6K3Tw9yQPUg2ka5g==}
 
-  chanfana@3.0.0:
-    resolution: {integrity: sha512-O143r9g6HlFeIdk05hEQyRIQEXTV+tjjF8fmOvByNT6zqKIzFbrs+IqnZ6reC/2s3j0XHzYZ38FE9qfTlR1PMw==}
+  chanfana@2.8.3:
+    resolution: {integrity: sha512-OBefbT8n+CeRYkC6lUoRgySTFbth+3LetxiNrCe0t+WgpQhhoIxPlo+lDYvNrLJgtsQr7XuPazm8yyxR8zwB7g==}
     hasBin: true
 
   cookie@1.1.1:
@@ -523,15 +523,12 @@ packages:
   zod@3.25.76:
     resolution: {integrity: sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==}
 
-  zod@4.3.6:
-    resolution: {integrity: sha512-rftlrkhHZOcjDwkGlnUtZZkvaPHCsDATp4pGpuOOMDaTdDDXF91wuVDJoWoPsKX/3YPQ5fHuF3STjcYyKr+Qhg==}
-
 snapshots:
 
-  '@asteasolutions/zod-to-openapi@8.4.0(zod@4.3.6)':
+  '@asteasolutions/zod-to-openapi@7.3.4(zod@3.25.76)':
     dependencies:
       openapi3-ts: 4.5.0
-      zod: 4.3.6
+      zod: 3.25.76
 
   '@cloudflare/kv-asset-handler@0.4.2': {}
 
@@ -768,13 +765,13 @@ snapshots:
 
   blake3-wasm@2.1.5: {}
 
-  chanfana@3.0.0:
+  chanfana@2.8.3:
     dependencies:
-      '@asteasolutions/zod-to-openapi': 8.4.0(zod@4.3.6)
+      '@asteasolutions/zod-to-openapi': 7.3.4(zod@3.25.76)
       js-yaml: 4.1.1
       openapi3-ts: 4.5.0
       yargs-parser: 22.0.0
-      zod: 4.3.6
+      zod: 3.25.76
 
   cookie@1.1.1: {}
 
@@ -930,5 +927,3 @@ snapshots:
       youch-core: 0.3.3
 
   zod@3.25.76: {}
-
-  zod@4.3.6: {}