feat(CallFeature): implement call functionality and integrate WebSocket signaling

- Updated app.json to include microphone permissions and background audio support.
- Added call-related dependencies in package.json and package-lock.json.
- Enhanced ChatScreen to initiate calls and handle call actions.
- Introduced call components in the layout for incoming call handling.
- Expanded WebSocket service to manage call signaling messages and events.
- Refactored authStore to initialize call state on user authentication.

src/stores/authStore.ts

@@ -15,6 +15,7 @@ import { create } from 'zustand';
 import { User } from '../types';
 import { authService, resolveAuthApiError, LoginRequest, RegisterRequest } from '../services';
 import { wsService } from '../services/wsService';
+import { callStore } from './callStore';
 import {
   initDatabase,
   closeDatabase,
@@ -96,6 +97,7 @@ function resolveLoginError(error: any): string {
 async function startRealtime(): Promise<void> {
   try {
     await wsService.start();
+    callStore.getState().initCall();
   } catch (error) {
     console.error('[AuthStore] 启动 SSE 服务失败:', error);
   }