feat: 添加好友功能并集成 LiteLLM 代理服务

- 新增好友搜索、添加、好友列表功能
- 集成 LiteLLM 代理服务及多模型定价配置
- 更新 iOS CocoaPods 配置
- 更新 .gitignore 和环境变量配置

apps/lib/features/settings/ui/screens/settings_screen.dart

@@ -3,6 +3,7 @@ import 'package:go_router/go_router.dart';
 import '../../../../core/di/injection.dart';
 import '../../../../core/theme/design_tokens.dart';
 import '../../../../shared/widgets/page_header.dart' as widgets;
+import '../../../friends/data/friends_api.dart';
 import '../../../users/data/models/user_response.dart';
 import '../../../users/data/users_api.dart';
 
@@ -16,20 +17,35 @@ class SettingsScreen extends StatefulWidget {
 class _SettingsScreenState extends State<SettingsScreen> {
   UserResponse? _user;
   bool _isLoading = true;
+  int _friendsCount = 0;
+  String? _firstFriendName;
 
   @override
   void initState() {
     super.initState();
-    _loadUser();
+    _loadData();
   }
 
-  Future<void> _loadUser() async {
+  Future<void> _loadData() async {
     try {
       final usersApi = sl<UsersApi>();
-      final user = await usersApi.getMe();
+      final friendsApi = sl<FriendsApi>();
+
+      final results = await Future.wait([
+        usersApi.getMe(),
+        friendsApi.getFriends(),
+      ]);
+
+      final user = results[0] as UserResponse;
+      final friends = results[1] as List<FriendResponse>;
+
       if (mounted) {
         setState(() {
           _user = user;
+          _friendsCount = friends.length;
+          _firstFriendName = friends.isNotEmpty
+              ? friends.first.friend.username
+              : null;
           _isLoading = false;
         });
       }
@@ -181,6 +197,16 @@ class _SettingsScreenState extends State<SettingsScreen> {
     );
   }
 
+  String _buildFriendsSubtitle() {
+    if (_friendsCount == 0) {
+      return '暂无联系人';
+    }
+    if (_friendsCount == 1) {
+      return '已添加 1 位：$_firstFriendName';
+    }
+    return '已添加 $_friendsCount 位联系人';
+  }
+
   Widget _buildQuickActions(BuildContext context) {
     return Container(
       height: 120,
@@ -199,7 +225,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
               iconBg: AppColors.surfaceTertiary,
               iconBorder: const Color(0xFFE6ECF7),
               title: '联系人',
-              subtitle: '已添加 1 位：Toki',
+              subtitle: _buildFriendsSubtitle(),
               onTap: () => context.push('/contacts'),
             ),
           ),