feat(缓存): 添加本地缓存功能并优化网络状态提示

实现本地缓存管理器，支持预加载开关和排行榜数据缓存
优化网络状态提示文案和错误处理
移除调试日志打印，改进用户体验

lib/views/profile/settings/app_fun.dart

@@ -3,6 +3,7 @@ import 'package:shared_preferences/shared_preferences.dart';
 import '../../../constants/app_constants.dart';
 import './widgets.dart';
 import '../../home/home-load.dart';
+import '../../../controllers/load/locally.dart';
 
 /// 时间: 2026-03-26
 /// 功能: 功能设置页面
@@ -22,6 +23,7 @@ class _AppFunSettingsPageState extends State<AppFunSettingsPage> {
   bool _soundEnabled = true;
   bool _vibrationEnabled = true;
   bool _darkModeEnabled = false;
+  bool _preloadEnabled = true;
   bool _notificationEnabled = true;
   int _cacheSize = 128;
 
@@ -40,6 +42,7 @@ class _AppFunSettingsPageState extends State<AppFunSettingsPage> {
       setState(() {
         _autoRefreshEnabled = prefs.getBool(_autoRefreshKey) ?? false;
         _debugInfoEnabled = prefs.getBool(_debugInfoKey) ?? false;
+        _preloadEnabled = prefs.getBool('preload_enabled') ?? true;
       });
     }
   }
@@ -66,6 +69,15 @@ class _AppFunSettingsPageState extends State<AppFunSettingsPage> {
     }
   }
 
+  Future<void> _setPreload(bool value) async {
+    await LocalCacheManager().setPreloadEnabled(value);
+    if (mounted) {
+      setState(() {
+        _preloadEnabled = value;
+      });
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -106,11 +118,12 @@ class _AppFunSettingsPageState extends State<AppFunSettingsPage> {
             ),
             _buildSwitchItem(
               '预加载',
-              '开启后优先使用本地缓存，\n减少与服务器的通信次数',
-              //关闭后，优先使用云端数据，无延迟，但刷新缓慢
-              Icons.notifications_active,
-              _notificationEnabled,
-              (value) => setState(() => _notificationEnabled = value),
+              _preloadEnabled
+                  ? '开启后 部分数据优先使用本地缓存，减少与服务器的通信次数'
+                  : '关闭后，优先使用云端数据，无延迟，但刷新缓慢',
+              Icons.storage,
+              _preloadEnabled,
+              _setPreload,
             ),
           ]),
           const SizedBox(height: 16),

lib/views/profile/settings/offline-data.dart

@@ -445,7 +445,7 @@ class _OfflineDataPageState extends State<OfflineDataPage> {
             children: [
               CircularProgressIndicator(),
               SizedBox(width: 16),
-              Text('正在获取服务器信息...'),
+              Text('正在检测网络状态...'),
             ],
           ),
         );