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/_templates/模块README-模板.md

@@ -1,9 +1,9 @@
 # [模块代号] - [模块名称]
 
-> **妯″潡浠ｅ彿锛?* [浠ｅ彿] ([鑻辨枃鍏ㄧО])  
+> **模块代号：** [代号] ([英文全称])  
 > **开发状态：** [✅已完成 / ⏳开发中 / ⏳规划中]  
-> **鍟嗕笟浠峰€硷細** 猸愨瓙猸愨瓙猸?[璇勭骇]  
-> **鐙<EFBFBD>珛鎬э細** 猸愨瓙猸愨瓙猸?[璇勭骇]  
+> **商业价值：** ⭐⭐⭐⭐⭐ [评级]  
+> **独立性：** ⭐⭐⭐⭐⭐ [评级]  
 > **优先级：** [P0/P1/P2]
 
 ---
@@ -18,12 +18,12 @@
 
 ## 🎯 核心功能
 
-### [宸插畬鎴愬姛鑳?/ 璁″垝鍔熻兘]
-1. [鉁?鈴砞 **鍔熻兘1** - 绠€瑕佹弿杩?
-2. [鉁?鈴砞 **鍔熻兘2** - 绠€瑕佹弿杩?
-3. [鉁?鈴砞 **鍔熻兘3** - 绠€瑕佹弿杩?
+### [已完成功能 / 计划功能]
+1. [✅/⏳] **功能1** - 简要描述
+2. [✅/⏳] **功能2** - 简要描述
+3. [✅/⏳] **功能3** - 简要描述
 
-**[鏈<EFBFBD>懆/涓嬩竴姝<E7ABB4>閲嶇偣锛?* [褰撳墠閲嶇偣]
+**[本周/下一步]重点：** [当前重点]
 
 ---
 
@@ -33,17 +33,17 @@
 [模块代号]-[模块名称]/
   ├── [AI对接] [代号]快速上下文.md    # [状态]
   ├── 00-项目概述/
-  鈹?  鈹溾攢鈹€ 01-浜у搧闇€姹傛枃妗?PRD).md    # [鐘舵€乚
-  鈹?  鈹斺攢鈹€ README.md
+  │   ├── 01-产品需求文档(PRD).md    # [状态]
+  │   └── README.md
   ├── 01-设计文档/
-  鈹?  鈹溾攢鈹€ 01-鎶€鏈<E282AC>灦鏋勮<E98F8B>璁?md          # [鐘舵€乚
-  鈹?  鈹溾攢鈹€ 02-鏁版嵁搴撹<E690B4>璁?md            # [鐘舵€乚
-  鈹?  鈹溾攢鈹€ 03-API璁捐<EFBFBD>.md               # [鐘舵€乚
-  鈹?  鈹斺攢鈹€ README.md
+  │   ├── 01-技术架构设计.md          # [状态]
+  │   ├── 02-数据库设计.md            # [状态]
+  │   ├── 03-API设计.md               # [状态]
+  │   └── README.md
   ├── 02-业务规则/
-  鈹溾攢鈹€ 03-寮€鍙戣<E98D99>鍒?
+  ├── 03-开发计划/
   ├── 04-测试文档/
-  鈹斺攢鈹€ README.md                        # 鉁?褰撳墠鏂囨。
+  └── README.md                        # ✅ 当前文档
 ```
 
 ---
@@ -57,13 +57,13 @@
 
 ## 🎯 商业模式
 
-**鐩<EFBFBD>爣瀹㈡埛锛?* [鐩<>爣瀹㈡埛缇<E59F9B>  
-**鍞<EFBFBD>崠鏂瑰紡锛?* [鐙<>珛浜у搧 / 缁勫悎鍞<E6828E>崠 / 骞冲彴鍔熻兘]  
-**瀹氫环绛栫暐锛?* [瀹氫环鏂瑰紡]
+**目标客户：** [目标客户群]  
+**售卖方式：** [独立产品 / 组合售卖 / 平台功能]  
+**定价策略：** [定价方式]
 
 ---
 
-## 鈿狅笍 [鎶€鏈<E282AC>毦鐐?/ 鏍稿績鐗硅壊]
+## ⚠️ [技术难点 / 核心特色]
 
 [如果有特别的技术难点或核心特色，在这里说明]