feat(admin): Add user management and upgrade to module permission system

Features - User Management (Phase 4.1):
- Database: Add user_modules table for fine-grained module permissions
- Database: Add 4 user permissions (view/create/edit/delete) to role_permissions
- Backend: UserService (780 lines) - CRUD with tenant isolation
- Backend: UserController + UserRoutes (648 lines) - 13 API endpoints
- Backend: Batch import users from Excel
- Frontend: UserListPage (412 lines) - list/filter/search/pagination
- Frontend: UserFormPage (341 lines) - create/edit with module config
- Frontend: UserDetailPage (393 lines) - details/tenant/module management
- Frontend: 3 modal components (592 lines) - import/assign/configure
- API: GET/POST/PUT/DELETE /api/admin/users/* endpoints

Architecture Upgrade - Module Permission System:
- Backend: Add getUserModules() method in auth.service
- Backend: Login API returns modules array in user object
- Frontend: AuthContext adds hasModule() method
- Frontend: Navigation filters modules based on user.modules
- Frontend: RouteGuard checks requiredModule instead of requiredVersion
- Frontend: Remove deprecated version-based permission system
- UX: Only show accessible modules in navigation (clean UI)
- UX: Smart redirect after login (avoid 403 for regular users)

Fixes:
- Fix UTF-8 encoding corruption in ~100 docs files
- Fix pageSize type conversion in userService (String to Number)
- Fix authUser undefined error in TopNavigation
- Fix login redirect logic with role-based access check
- Update Git commit guidelines v1.2 with UTF-8 safety rules

Database Changes:
- CREATE TABLE user_modules (user_id, tenant_id, module_code, is_enabled)
- ADD UNIQUE CONSTRAINT (user_id, tenant_id, module_code)
- INSERT 4 permissions + role assignments
- UPDATE PUBLIC tenant with 8 module subscriptions

Technical:
- Backend: 5 new files (~2400 lines)
- Frontend: 10 new files (~2500 lines)
- Docs: 1 development record + 2 status updates + 1 guideline update
- Total: ~4900 lines of code

Status: User management 100% complete, module permission system operational

docs/03-业务模块/PKB-个人知识库/README.md

@@ -1,37 +1,37 @@
-# PKB - 涓<EFBFBD>汉鐭ヨ瘑搴?
+# PKB - 个人知识库
 
-> **妯″潡浠ｅ彿锛?* PKB (Personal Knowledge Base)  
-> **寮€鍙戠姸鎬侊細** 鉁?宸插畬鎴? 
-> **鍟嗕笟浠峰€硷細** 猸愨瓙猸? 
-> **鐙<EFBFBD>珛鎬э細** 猸愨瓙猸?
+> **模块代号：** PKB (Personal Knowledge Base)  
+> **开发状态：** ✅ 已完成  
+> **商业价值：** ⭐⭐⭐  
+> **独立性：** ⭐⭐⭐
 
 ---
 
 ## 📋 模块概述
 
-涓<EFBFBD>汉鐭ヨ瘑搴撳厑璁哥敤鎴峰垱寤虹<EFBFBD>浜烘枃鐚<EFBFBD>簱锛屽苟鍩轰簬搴撳唴鏂囩尞杩涜<EFBFBD>AI闂<EFBFBD>瓟锛圧AG锛夈€?
+个人知识库允许用户创建私人文献库，并基于库内文献进行AI问答（RAG）。
 
 ---
 
 ## 🎯 核心功能
 
-### 宸插畬鎴愬姛鑳?
-1. 鉁?**鐭ヨ瘑搴揅RUD** - 鍒涘缓銆佹煡鐪嬨€佺紪杈戙€佸垹闄?
-2. 鉁?**鏂囨。涓婁紶** - PDF銆乄ord銆乀XT銆丮arkdown
-3. 鉁?**RAG闂<EFBFBD>瓟** - 鍩轰簬鐭ヨ瘑搴撳唴瀹归棶绛?
-4. 鉁?**@鐭ヨ瘑搴撳紩鐢?* - 鏅鸿兘寮曠敤绯荤粺锛?00%鍑嗙‘婧<E28098>簮锛?
-5. 鉁?**閰嶉<E996B0>绠＄悊** - 姣忕敤鎴?涓<>煡璇嗗簱锛屾瘡搴?0涓<30>枃妗?
+### 已完成功能
+1. ✅ **知识库CRUD** - 创建、查看、编辑、删除
+2. ✅ **文档上传** - PDF、Word、TXT、Markdown
+3. ✅ **RAG问答** - 基于知识库内容问答
+4. ✅ **@知识库引用** - 智能引用系统（100%准确溯源）
+5. ✅ **配额管理** - 每用户3个知识库，每库50个文档
 
 ---
 
 ## 📂 文档结构
 
 ```
-PKB-涓<EFBFBD>汉鐭ヨ瘑搴?
-  鈹溾攢鈹€ [AI瀵规帴] PKB蹇<EFBFBD>€熶笂涓嬫枃.md      # 鈴?寰呭垱寤?
+PKB-个人知识库/
+  ├── [AI对接] PKB快速上下文.md      # ⏳ 待创建
   ├── 00-项目概述/
   ├── 01-设计文档/
-  鈹斺攢鈹€ README.md                        # 鉁?褰撳墠鏂囨。
+  └── README.md                        # ✅ 当前文档
 ```
 
 ---
@@ -40,7 +40,7 @@ PKB-个人知识
 
 - **LLM网关** - RAG问答
 - **文档处理引擎** - 文档文本提取
-- **RAG寮曟搸** - 鍚戦噺妫€绱?
+- **RAG引擎** - 向量检索
 
 ---