feat(modules): 模块系统支持任务/API/UI 扩展

- 新增模块抽象与 manifest/版本范围、安装/启用/停用/回滚\n- 模块管理页面：上传 .tpm/.zip、状态与冲突提示\n- 任务中心/新建任务改为基于模块贡献动态展示（system 不出现在新建列表）\n- API 管理改为基于模块贡献动态创建与通用配置编辑\n- 支持模块扩展任务执行器与扩展页面入口 /ext/{moduleId}/{pageKey}\n\n内置模块：builtin.kick-api、builtin.tasks

src/TelegramPanel.Web/Modules/ModuleLoadContext.cs

@@ -0,0 +1,46 @@
+using System.Reflection;
+using System.Runtime.Loader;
+
+namespace TelegramPanel.Web.Modules;
+
+public sealed class ModuleLoadContext : AssemblyLoadContext
+{
+    private readonly AssemblyDependencyResolver _resolver;
+    private readonly string _baseDir;
+
+    public ModuleLoadContext(string mainAssemblyPath) : base(isCollectible: false)
+    {
+        if (string.IsNullOrWhiteSpace(mainAssemblyPath))
+            throw new ArgumentException("mainAssemblyPath 不能为空", nameof(mainAssemblyPath));
+
+        _resolver = new AssemblyDependencyResolver(mainAssemblyPath);
+        _baseDir = Path.GetDirectoryName(mainAssemblyPath) ?? "";
+    }
+
+    protected override Assembly? Load(AssemblyName assemblyName)
+    {
+        var path = _resolver.ResolveAssemblyToPath(assemblyName);
+        if (!string.IsNullOrWhiteSpace(path) && File.Exists(path))
+            return LoadFromAssemblyPath(path);
+
+        // fallback：如果模块未提供 deps.json，则在 lib 目录按名称寻找
+        var name = (assemblyName.Name ?? "").Trim();
+        if (name.Length == 0 || string.IsNullOrWhiteSpace(_baseDir))
+            return null;
+
+        var candidate = Path.Combine(_baseDir, name + ".dll");
+        if (File.Exists(candidate))
+            return LoadFromAssemblyPath(candidate);
+
+        return null;
+    }
+
+    protected override IntPtr LoadUnmanagedDll(string unmanagedDllName)
+    {
+        var path = _resolver.ResolveUnmanagedDllToPath(unmanagedDllName);
+        if (!string.IsNullOrWhiteSpace(path) && File.Exists(path))
+            return LoadUnmanagedDllFromPath(path);
+
+        return base.LoadUnmanagedDll(unmanagedDllName);
+    }
+}