refactor(navigation): replace direct navigation with navigation service

Replace direct `navigation.navigate()` and `navigation.getParent()?.navigate()` calls with centralized `navigationService.navigate()` across multiple screens. Convert screen component functions from JSX elements to array-returning functions in RootNavigator to fix React key warnings and improve render consistency.

- HomeScreen: use navigationService for post and user navigation
- PrivateChatInfoScreen: use navigationService for profile navigation
- ChatScreen: use navigationService for avatar press and user profile navigation
- RootNavigator: convert PublicScreens and AuthenticatedScreens to getPublicScreens() and getAuthenticatedScreens() functions returning arrays with proper keys

src/screens/message/PrivateChatInfoScreen.tsx

@@ -31,6 +31,7 @@ import { userManager } from '../../stores/userManager';
 import { Avatar, Text, Button, Loading, Divider } from '../../components/common';
 import { User } from '../../types';
 import { RootStackParamList, MessageStackParamList } from '../../navigation/types';
+import { navigationService } from '../../infrastructure/navigation/navigationService';
 
 type NavigationProp = NativeStackNavigationProp<MessageStackParamList>;
 type PrivateChatInfoRouteProp = RouteProp<MessageStackParamList, 'PrivateChatInfo'>;
@@ -149,9 +150,8 @@ const PrivateChatInfoScreen: React.FC = () => {
 
   // 查看用户资料
   const handleViewProfile = () => {
-    // 使用根导航跳转到用户资料页面
-    const rootNavigation = navigation.getParent();
-    rootNavigation?.navigate('UserProfile' as any, { userId });
+    // 使用导航服务跳转到用户资料页面
+    navigationService.navigate('UserProfile', { userId });
   };
 
   // 举报/投诉

src/screens/message/components/ChatScreen/useChatScreen.ts

@@ -31,6 +31,7 @@ import { groupService } from '../../../../services/groupService';
 import { userManager } from '../../../../stores/userManager';
 import { groupManager } from '../../../../stores/groupManager';
 import { RootStackParamList } from '../../../../navigation/types';
+import { navigationService } from '../../../../infrastructure/navigation/navigationService';
 import {
   GroupMessage,
   PanelType,
@@ -1039,9 +1040,9 @@ export const useChatScreen = () => {
   // 点击头像跳转到用户主页
   const handleAvatarPress = useCallback((userId: string) => {
     if (userId && userId !== currentUserId) {
-      navigation.navigate('UserProfile' as any, { userId: String(userId) });
+      navigationService.navigate('UserProfile', { userId: String(userId) });
     }
-  }, [navigation, currentUserId]);
+  }, [currentUserId]);
 
   // 长按头像@用户
   const handleAvatarLongPress = useCallback((senderId: string, nickname: string) => {
@@ -1113,8 +1114,7 @@ export const useChatScreen = () => {
         conversationId: conversationId || undefined,
       });
     } else if (otherUser?.id) {
-      const rootNavigation = navigation.getParent();
-      rootNavigation?.navigate('UserProfile' as any, { userId: String(otherUser.id) });
+      navigationService.navigate('UserProfile', { userId: String(otherUser.id) });
     }
   }, [navigation, isGroupChat, routeGroupId, otherUser]);