feat(auth): implement multi-step registration process and enhance background services

- Updated RegisterScreen to support a multi-step registration flow with components for email input, verification, and profile setup.
- Added new components: VerificationCodeInput, StepIndicator, and corresponding types for step management.
- Enhanced background service to check authentication status before executing tasks, improving app reliability.
- Updated TypeScript configuration to include module resolution and JSON module support.

This update significantly improves the user registration experience and ensures background tasks are only executed for authenticated users.

src/services/backgroundService.ts

@@ -32,9 +32,18 @@ const BACKGROUND_INTERVAL = 15; // 15 分钟
 let isInitialized = false;
 let appStateSubscription: any = null;
 
+// 导入 api 用于检查认证状态
+import { api } from './api';
+
 // 定义后台任务
 TaskManager.defineTask(BACKGROUND_FETCH_TASK, async () => {
   try {
+    // 检查是否已认证
+    const token = await api.getToken();
+    if (!token) {
+      return BackgroundFetch.BackgroundFetchResult.NoData;
+    }
+    
     // 检查 SSE 连接状态
     if (!wsService.isConnected()) {
       await wsService.connect();
@@ -51,6 +60,12 @@ TaskManager.defineTask(BACKGROUND_FETCH_TASK, async () => {
 // SSE 保活任务
 TaskManager.defineTask(REALTIME_KEEPALIVE_TASK, async () => {
   try {
+    // 检查是否已认证
+    const token = await api.getToken();
+    if (!token) {
+      return BackgroundFetch.BackgroundFetchResult.NoData;
+    }
+    
     if (!wsService.isConnected()) {
       await wsService.connect();
     }
@@ -116,9 +131,13 @@ function setupAppStateListener(): void {
     return;
   }
 
-  appStateSubscription = AppState.addEventListener('change', (nextAppState: AppStateStatus) => {
-    void nextAppState;
+  appStateSubscription = AppState.addEventListener('change', async (nextAppState: AppStateStatus) => {
     if (nextAppState === 'active') {
+      // 检查是否已认证
+      const token = await api.getToken();
+      if (!token) {
+        return;
+      }
       // App 回到前台，确保连接
       if (!wsService.isConnected()) {
         wsService.connect();

src/services/wsService.ts

@@ -335,9 +335,9 @@ class WebSocketService {
     try {
       const token = await api.getToken();
       if (!token) {
-        console.error('[WebSocket] No token available');
+        console.log('[WebSocket] No token available, skipping connection');
         this.isConnecting = false;
-        this.scheduleReconnect();
+        // 没有 token 时不要重连，等待用户登录后再连接
         return false;
       }