fix(knowledge): deep audit — 18 bugs fixed across backend + frontend

CRITICAL:
- Migration permission seed WHERE name → WHERE id (matched 0 rows, all KB APIs broken)

HIGH:
- analytics_quality SQL alias + missing comma fix
- search() duplicate else block compile error
- chunk_content duplicate var declarations + type mismatch
- SQL invalid escape sequences
- delete_category missing rows_affected check

MEDIUM:
- analytics_overview hit_rate vs positive_feedback_rate separation
- analytics_quality GROUP BY kc.id,kc.name (same-name category merge)
- update_category handler trim + empty name validation
- update_item duplicate VALID_STATUSES inside transaction
- page_size max(1) lower bound in list handlers
- batch_create title/content/length validation
- embedding dispatch silent error → tracing::warn
- Version modal close clears detailItem state
- Search empty state distinguishes not-searched vs no-results
- Create modal cancel resets form

admin-v2/src/services/knowledge.ts

@@ -76,6 +76,16 @@ export const knowledgeService = {
   deleteCategory: (id: string) =>
     request.delete(`/knowledge/categories/${id}`).then((r) => r.data),
 
+  updateCategory: (id: string, data: { name?: string; description?: string; parent_id?: string; icon?: string }) =>
+    request.put(`/knowledge/categories/${id}`, data).then((r) => r.data),
+
+  reorderCategories: (items: Array<{ id: string; sort_order: number }>) =>
+    request.patch('/knowledge/categories/reorder', { items }).then((r) => r.data),
+
+  getCategoryItems: (id: string, params?: { page?: number; page_size?: number; status?: string }, signal?: AbortSignal) =>
+    request.get<ListItemsResponse>(`/knowledge/categories/${id}/items`, withSignal({ params }, signal))
+      .then((r) => r.data),
+
   // 条目
   listItems: (params: { page?: number; page_size?: number; category_id?: string; status?: string; keyword?: string }, signal?: AbortSignal) =>
     request.get<ListItemsResponse>('/knowledge/items', withSignal({ params }, signal))
@@ -125,4 +135,28 @@ export const knowledgeService = {
   getTopItems: (signal?: AbortSignal) =>
     request.get('/knowledge/analytics/top-items', withSignal({}, signal))
       .then((r) => r.data),
+
+  getQuality: (signal?: AbortSignal) =>
+    request.get('/knowledge/analytics/quality', withSignal({}, signal))
+      .then((r) => r.data),
+
+  getGaps: (signal?: AbortSignal) =>
+    request.get('/knowledge/analytics/gaps', withSignal({}, signal))
+      .then((r) => r.data),
+
+  // 版本
+  getVersions: (itemId: string, signal?: AbortSignal) =>
+    request.get(`/knowledge/items/${itemId}/versions`, withSignal({}, signal))
+      .then((r) => r.data),
+
+  rollbackVersion: (itemId: string, version: number) =>
+    request.post(`/knowledge/items/${itemId}/rollback/${version}`).then((r) => r.data),
+
+  // 推荐搜索
+  recommend: (data: { query: string; category_id?: string; limit?: number }) =>
+    request.post<SearchResult[]>('/knowledge/recommend', data).then((r) => r.data),
+
+  // 导入
+  importItems: (data: { category_id: string; files: Array<{ content: string; title?: string; keywords?: string[]; tags?: string[] }> }) =>
+    request.post('/knowledge/items/import', data).then((r) => r.data),
 }