feat(mine): 我的 Tab 全量实现 (#5~#13)

从 im-client-ios-swift-demo 搬运 Settings 逻辑，对齐 Gitea issue #5–#13

## 基础设施
- AuthNotifier 新增 currentUid 字段，login() 接受 uid 参数 (#5)
- LoginViewModel 登录成功后传入 user.uid
- ApiPaths 补充 account/block/store 系列路径
- Tab 重命名"设置"→"我的"，icon 改为 person_outline (#5)
- AppRouteName 新增5条子路由 (edit-profile/blocklist/language/network-diagnostics/about)
- app_router + auth_guard 同步注册新路由

## Settings Feature
- SettingsViewModel 重写为 NotifierProvider（去除 @riverpod 依赖）
  - build() 自动触发 loadProfile()
  - logout() 完整流程：API → WS 断开 → DB 关闭 → AuthNotifier
  - 6 个 navigateTo* 方法
- SettingsPage 完整 UI：资料卡 / 偏好设置 / 工具 / 关于 / 退出登录按钮 (#5 #7)
- FetchProfileUseCase: GET /app/api/user/profile (#5)
- LogoutUseCase: logout + disconnect + closeDatabase (#7)
- UpdateProfileUseCase + UpdateProfileRequest: POST /app/api/user/update-profile (#6)
- EditProfilePage + EditProfileViewModel: 昵称/bio 编辑 (#6)
- LanguagePage: 语言选择 UI 框架，l10n_sdk 待接入 (#9)
- BlocklistPage: 黑名单框架，API 待实现 (#10)
- NetworkDiagnosticsPage + ViewModel: 四步诊断（连通/TCP/DNS/HTTPS）(#12)
- AboutPage: 版本号 + 服务条款/隐私政策入口 (#13)
- settings_providers.dart: 扩展 DI 装配

## 文档
- Doc/mine_tab_architecture.md: 架构说明、数据流、路由、待完成事项

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

apps/im_app/lib/app/di/app_providers.dart

@@ -19,11 +19,16 @@ import 'package:im_app/app/di/network_provider.dart';
 /// - `login` / `logout`：同步更新安全存储
 class AuthNotifier extends ChangeNotifier {
   bool _isLoggedIn = false;
+  int? _currentUid;
 
   bool get isLoggedIn => _isLoggedIn;
 
-  void login() {
+  /// 登录用户的 UID，登录成功后由 LoginViewModel 写入
+  int? get currentUid => _currentUid;
+
+  void login({required int uid}) {
     _isLoggedIn = true;
+    _currentUid = uid;
     // TODO: 接入 cipher_guard_sdk 后，在此处完成 RSA 密钥注入：
     // 1. 从安全存储（keychain / secure storage）读取公私钥对（只读一次）
     // 2. cipherSdk.setActiveKeyPair(publicKey: pubPem, privateKey: privPem)
@@ -33,6 +38,7 @@ class AuthNotifier extends ChangeNotifier {
 
   void logout() {
     _isLoggedIn = false;
+    _currentUid = null;
     // TODO: 接入 cipher_guard_sdk 后，退出登录时清除内存密钥：
     // cipherSdk.clearActiveKeyPair()
     // cipherSdk.clearDerivedKeyCache()

apps/im_app/lib/app/router/app_route_name.dart

@@ -68,6 +68,11 @@ enum AppRouteName {
 
   // ── Settings 子路由 ───────────────────────────────────────────────────────
   settingsTheme('/settings/theme'),
+  settingsEditProfile('/settings/edit-profile'),
+  settingsBlocklist('/settings/blocklist'),
+  settingsLanguage('/settings/language'),
+  settingsNetworkDiagnostics('/settings/network-diagnostics'),
+  settingsAbout('/settings/about'),
 
   // ── 全屏页面（无底部导航栏）──────────────────────────────────────────────
   login('/login');

apps/im_app/lib/app/router/app_router.dart

@@ -10,6 +10,11 @@ import 'package:im_app/features/contact/view/contact_page.dart';
 import 'package:im_app/features/login/view/login_page.dart';
 import 'package:im_app/features/settings/view/settings_page.dart';
 import 'package:im_app/features/settings/view/theme_view.dart';
+import 'package:im_app/features/settings/view/edit_profile_page.dart';
+import 'package:im_app/features/settings/view/blocklist_page.dart';
+import 'package:im_app/features/settings/view/language_page.dart';
+import 'package:im_app/features/settings/view/network_diagnostics_page.dart';
+import 'package:im_app/features/settings/view/about_page.dart';
 import 'package:im_app/app/di/app_providers.dart';
 import 'package:im_app/app/router/app_route_name.dart';
 import 'package:im_app/app/router/guards/auth_guard.dart';
@@ -152,6 +157,31 @@ final routerProvider = Provider<GoRouter>((ref) {
         path: AppRouteName.settingsTheme.path,
         builder: (context, state) => const ThemeView(),
       ),
+      GoRoute(
+        parentNavigatorKey: _rootKey,
+        path: AppRouteName.settingsEditProfile.path,
+        builder: (context, state) => const EditProfilePage(),
+      ),
+      GoRoute(
+        parentNavigatorKey: _rootKey,
+        path: AppRouteName.settingsBlocklist.path,
+        builder: (context, state) => const BlocklistPage(),
+      ),
+      GoRoute(
+        parentNavigatorKey: _rootKey,
+        path: AppRouteName.settingsLanguage.path,
+        builder: (context, state) => const LanguagePage(),
+      ),
+      GoRoute(
+        parentNavigatorKey: _rootKey,
+        path: AppRouteName.settingsNetworkDiagnostics.path,
+        builder: (context, state) => const NetworkDiagnosticsPage(),
+      ),
+      GoRoute(
+        parentNavigatorKey: _rootKey,
+        path: AppRouteName.settingsAbout.path,
+        builder: (context, state) => const AboutPage(),
+      ),
       GoRoute(
         parentNavigatorKey: _rootKey,
         path: AppRouteName.login.path,

apps/im_app/lib/app/router/guards/auth_guard.dart

@@ -40,6 +40,11 @@ String? authGuard(AuthNotifier authNotifier, GoRouterState state) {
     case AppRouteName.contact:
     case AppRouteName.settings:
     case AppRouteName.settingsTheme:
+    case AppRouteName.settingsEditProfile:
+    case AppRouteName.settingsBlocklist:
+    case AppRouteName.settingsLanguage:
+    case AppRouteName.settingsNetworkDiagnostics:
+    case AppRouteName.settingsAbout:
     case AppRouteName.chatDBTest:
       // 受保护路由 → 未登录跳登录页
       return isLoggedIn ? null : AppRouteName.login.path;