feat: 新增模型管理功能（供应商 + 模型 CRUD）

- 新增 providers/models 数据库表、迁移和数据访问层
- 新增 15 个后端 API 路由（供应商/模型 CRUD + 连通性测试）
- 新增 AI 服务层（registry.ts: buildProviderRegistry + testProviderConnection）
- 新增前端模型管理页面（Tabs: 供应商/模型，含表格、表单、工具栏）
- 新增前端 hooks（use-providers, use-models）
- 新增共享类型和 MODEL_CAPABILITIES 常量
- 新增 10 个测试文件（66 个测试用例，4 个因 bun test ESM 兼容问题待修复）
- 更新开发文档（architecture, backend, frontend）
- 附带 apply-review 修复：统一错误响应、提取共享常量、清理重复测试

注意：registry.test.ts 中 4 个测试因 bun test 无法解析
createProviderRegistry ESM 导出而失败，详情见 context.md

src/server/server.ts

@@ -43,6 +43,42 @@ export function startServer(options: StartServerOptions) {
           return handleMeta(mode, resolvedVersion);
         },
       },
+      "/api/models": {
+        GET: async (req) => {
+          const { handleListModels } = await import("./routes/models/list");
+          return handleListModels(req, db, mode);
+        },
+        POST: async (req) => {
+          const { handleCreateModel } = await import("./routes/models/create");
+          return handleCreateModel(req, db, mode);
+        },
+      },
+      "/api/models/:id": {
+        DELETE: async (req) => {
+          const { handleDeleteModel } = await import("./routes/models/delete");
+          return handleDeleteModel(req, db, mode);
+        },
+        GET: async (req) => {
+          const { handleGetModel } = await import("./routes/models/get");
+          return handleGetModel(req, db, mode);
+        },
+        PATCH: async (req) => {
+          const { handleUpdateModel } = await import("./routes/models/update");
+          return handleUpdateModel(req, db, mode);
+        },
+      },
+      "/api/models/:id/disable": {
+        POST: async (req) => {
+          const { handleDisableModel } = await import("./routes/models/disable");
+          return handleDisableModel(req, db, mode);
+        },
+      },
+      "/api/models/:id/enable": {
+        POST: async (req) => {
+          const { handleEnableModel } = await import("./routes/models/enable");
+          return handleEnableModel(req, db, mode);
+        },
+      },
       "/api/projects": {
         GET: async (req) => {
           const { handleListProjects } = await import("./routes/projects/list");
@@ -79,6 +115,48 @@ export function startServer(options: StartServerOptions) {
           return handleRestoreProject(req, db, mode);
         },
       },
+      "/api/providers": {
+        GET: async (req) => {
+          const { handleListProviders } = await import("./routes/providers/list");
+          return handleListProviders(req, db, mode);
+        },
+        POST: async (req) => {
+          const { handleCreateProvider } = await import("./routes/providers/create");
+          return handleCreateProvider(req, db, mode);
+        },
+      },
+      "/api/providers/:id": {
+        DELETE: async (req) => {
+          const { handleDeleteProvider } = await import("./routes/providers/delete");
+          return handleDeleteProvider(req, db, mode);
+        },
+        GET: async (req) => {
+          const { handleGetProvider } = await import("./routes/providers/get");
+          return handleGetProvider(req, db, mode);
+        },
+        PATCH: async (req) => {
+          const { handleUpdateProvider } = await import("./routes/providers/update");
+          return handleUpdateProvider(req, db, mode);
+        },
+      },
+      "/api/providers/:id/disable": {
+        POST: async (req) => {
+          const { handleDisableProvider } = await import("./routes/providers/disable");
+          return handleDisableProvider(req, db, mode);
+        },
+      },
+      "/api/providers/:id/enable": {
+        POST: async (req) => {
+          const { handleEnableProvider } = await import("./routes/providers/enable");
+          return handleEnableProvider(req, db, mode);
+        },
+      },
+      "/api/providers/:id/test": {
+        POST: async (req) => {
+          const { handleTestProvider } = await import("./routes/providers/test");
+          return handleTestProvider(req, db, mode);
+        },
+      },
     },
   });