feat(admin-v2): add Knowledge base management page

- 4 tabs: Items (CRUD + ProTable), Categories (tree management), Search, Analytics
- Knowledge service with full API integration
- Nav item + breadcrumb + route registration
- Analytics overview with 8 KPI statistics

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

admin-v2/src/services/knowledge.ts

@@ -0,0 +1,128 @@
+import request, { withSignal } from './request'
+
+// === Types ===
+
+export interface CategoryResponse {
+  id: string
+  name: string
+  description: string | null
+  parent_id: string | null
+  icon: string | null
+  sort_order: number
+  item_count: number
+  children: CategoryResponse[]
+  created_at: string
+  updated_at: string
+}
+
+export interface KnowledgeItem {
+  id: string
+  category_id: string
+  title: string
+  content: string
+  keywords: string[]
+  related_questions: string[]
+  priority: number
+  status: string
+  version: number
+  source: string
+  tags: string[]
+  created_by: string
+  created_at: string
+  updated_at: string
+}
+
+export interface SearchResult {
+  chunk_id: string
+  item_id: string
+  item_title: string
+  category_name: string
+  content: string
+  score: number
+  keywords: string[]
+}
+
+export interface AnalyticsOverview {
+  total_items: number
+  active_items: number
+  total_categories: number
+  weekly_new_items: number
+  total_references: number
+  avg_reference_per_item: number
+  hit_rate: number
+  injection_rate: number
+  positive_feedback_rate: number
+  stale_items_count: number
+}
+
+export interface ListItemsResponse {
+  items: KnowledgeItem[]
+  total: number
+  page: number
+  page_size: number
+}
+
+// === Service ===
+
+export const knowledgeService = {
+  // 分类
+  listCategories: (signal?: AbortSignal) =>
+    request.get<CategoryResponse[]>('/knowledge/categories', withSignal({}, signal))
+      .then((r) => r.data),
+
+  createCategory: (data: { name: string; description?: string; parent_id?: string; icon?: string }) =>
+    request.post('/knowledge/categories', data).then((r) => r.data),
+
+  deleteCategory: (id: string) =>
+    request.delete(`/knowledge/categories/${id}`).then((r) => r.data),
+
+  // 条目
+  listItems: (params: { page?: number; page_size?: number; category_id?: string; status?: string; keyword?: string }, signal?: AbortSignal) =>
+    request.get<ListItemsResponse>('/knowledge/items', withSignal({ params }, signal))
+      .then((r) => r.data),
+
+  getItem: (id: string, signal?: AbortSignal) =>
+    request.get<KnowledgeItem>(`/knowledge/items/${id}`, withSignal({}, signal))
+      .then((r) => r.data),
+
+  createItem: (data: {
+    category_id: string
+    title: string
+    content: string
+    keywords?: string[]
+    related_questions?: string[]
+    priority?: number
+    tags?: string[]
+  }) => request.post('/knowledge/items', data).then((r) => r.data),
+
+  updateItem: (id: string, data: Record<string, unknown>) =>
+    request.put(`/knowledge/items/${id}`, data).then((r) => r.data),
+
+  deleteItem: (id: string) =>
+    request.delete(`/knowledge/items/${id}`).then((r) => r.data),
+
+  batchCreate: (items: Array<{
+    category_id: string
+    title: string
+    content: string
+    keywords?: string[]
+    tags?: string[]
+  }>) => request.post('/knowledge/items/batch', items).then((r) => r.data),
+
+  // 搜索
+  search: (data: { query: string; category_id?: string; limit?: number }) =>
+    request.post<SearchResult[]>('/knowledge/search', data).then((r) => r.data),
+
+  // 分析
+  getOverview: (signal?: AbortSignal) =>
+    request.get<AnalyticsOverview>('/knowledge/analytics/overview', withSignal({}, signal))
+      .then((r) => r.data),
+
+  getTrends: (signal?: AbortSignal) =>
+    request.get('/knowledge/analytics/trends', withSignal({}, signal))
+      .then((r) => r.data),
+
+  getTopItems: (signal?: AbortSignal) =>
+    request.get('/knowledge/analytics/top-items', withSignal({}, signal))
+      .then((r) => r.data),
+}