feat: 添加连接帮助功能和内网穿透引导

- 断开连接时提示用户可使用 cpolar 等内网穿透工具
- 设置菜单新增"连接帮助"入口，弹窗说明 Symmetric NAT 限制及解决方案
- Live2DRightToolbar 新增 connectionHelp 菜单项和图标映射
- 更新 react-native-live2d 子模块

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

Author: Tonnodoubt

app/(tabs)/main.tsx

@@ -969,6 +969,17 @@ const MainUIScreen: React.FC<MainUIScreenProps> = () => {
       doReload();
       return;
     }
+    if (id === 'connectionHelp') {
+      Alert.alert(
+        '连接帮助',
+        '如果手机无法连接电脑，可能是网络环境限制（Symmetric NAT）。\n\n' +
+        '解决方法：在电脑端安装内网穿透工具：\n' +
+        '• cpolar（推荐）: cpolar.com\n' +
+        '• natapp: natapp.cn\n\n' +
+        '安装后将本地端口 48920 映射到公网，用获取的公网地址重新扫码连接。'
+      );
+      return;
+    }
 
     Alert.alert('功能提示', `即将打开: ${id}`);
   }, [config, toolbarMicEnabled, mainManager, chat, audio, syncLive2dModel]);

packages/project-neko-components/src/Live2DRightToolbar/Live2DRightToolbar.native.tsx

@@ -101,6 +101,7 @@ export function Live2DRightToolbar({
       voiceClone: require('../../../../assets/icons/set_off.png'),
       memoryBrowser: require('../../../../assets/icons/set_off.png'),
       steamWorkshop: require('../../../../assets/icons/set_off.png'),
+      connectionHelp: require('../../../../assets/icons/set_off.png'),
     },
   });
 

packages/project-neko-components/src/Live2DRightToolbar/hooks.ts

@@ -313,6 +313,11 @@ export function useSettingsMenuItems<TIcon = ToolbarIcon>(
         label: tOrDefault(t, 'settings.menu.steamWorkshop', '创意工坊'),
         icon: mkIcon('steamWorkshop', 'Steam_icon_logo.png'),
       },
+      {
+        id: 'connectionHelp' as const,
+        label: tOrDefault(t, 'settings.menu.connectionHelp', '连接帮助'),
+        icon: mkIcon('connectionHelp', 'set_off.png'),
+      },
     ];
   }, [t, iconBasePath, icons]);
 }

packages/project-neko-components/src/Live2DRightToolbar/types.ts

@@ -36,7 +36,8 @@ export type Live2DSettingsMenuId =
   | "reload"
   | "voiceClone"
   | "memoryBrowser"
-  | "steamWorkshop";
+  | "steamWorkshop"
+  | "connectionHelp";
 
 export interface Live2DRightToolbarProps {
   visible?: boolean;