feat(navigation): add profile stack navigator and fix API endpoints

- Add ProfileStackNavigatorComponent with full navigation stack (Profile, Settings, EditProfile, AccountSecurity, MyPosts, Bookmarks, NotificationSettings, BlockedUsers)
- Add null checks for response data in authService login, register, and refreshToken methods
- Fix postService API routes to use correct endpoints (/posts instead of /posts/cursor)
- Remove completed cursor pagination design document

src/navigation/SimpleMobileTabNavigator.tsx

@@ -40,8 +40,21 @@ export type ScheduleStackParamList = {
   CourseDetail: { course: any; relatedCourses?: any[] };
 };
 
+// Profile Stack 类型定义
+export type ProfileStackParamList = {
+  Profile: undefined;
+  Settings: undefined;
+  EditProfile: undefined;
+  AccountSecurity: undefined;
+  MyPosts: undefined;
+  Bookmarks: undefined;
+  NotificationSettings: undefined;
+  BlockedUsers: undefined;
+};
+
 // ==================== Stack Navigators ====================
 const ScheduleStack = createNativeStackNavigator<ScheduleStackParamList>();
+const ProfileStack = createNativeStackNavigator<ProfileStackParamList>();
 
 // ==================== 常量 ====================
 const TAB_BAR_HEIGHT = 64;
@@ -80,6 +93,84 @@ function ScheduleStackNavigatorComponent() {
   );
 }
 
+/**
+ * Profile Stack Navigator 组件
+ */
+function ProfileStackNavigatorComponent() {
+  return (
+    <ProfileStack.Navigator
+      screenOptions={{
+        headerStyle: {
+          backgroundColor: colors.background.paper,
+        },
+        headerTintColor: colors.text.primary,
+        headerTitleStyle: {
+          fontWeight: '600',
+        },
+        headerBackTitle: '',
+        headerShadowVisible: false,
+      }}
+    >
+      <ProfileStack.Screen
+        name="Profile"
+        component={ProfileScreen}
+        options={{
+          headerShown: false,
+        }}
+      />
+      <ProfileStack.Screen
+        name="Settings"
+        component={SettingsScreen}
+        options={{
+          title: '设置',
+        }}
+      />
+      <ProfileStack.Screen
+        name="EditProfile"
+        component={EditProfileScreen}
+        options={{
+          title: '编辑资料',
+        }}
+      />
+      <ProfileStack.Screen
+        name="AccountSecurity"
+        component={AccountSecurityScreen}
+        options={{
+          title: '账号安全',
+        }}
+      />
+      <ProfileStack.Screen
+        name="MyPosts"
+        component={ProfileScreen}
+        options={{
+          title: '我的帖子',
+        }}
+      />
+      <ProfileStack.Screen
+        name="Bookmarks"
+        component={ProfileScreen}
+        options={{
+          title: '收藏',
+        }}
+      />
+      <ProfileStack.Screen
+        name="NotificationSettings"
+        component={NotificationSettingsScreen}
+        options={{
+          title: '通知设置',
+        }}
+      />
+      <ProfileStack.Screen
+        name="BlockedUsers"
+        component={BlockedUsersScreen}
+        options={{
+          title: '黑名单',
+        }}
+      />
+    </ProfileStack.Navigator>
+  );
+}
+
 /**
  * 主组件：SimpleMobileTabNavigator
  */
@@ -108,7 +199,7 @@ export function SimpleMobileTabNavigator() {
       case 'ScheduleTab':
         return <ScheduleStackNavigatorComponent />;
       case 'ProfileTab':
-        return <ProfileScreen />;
+        return <ProfileStackNavigatorComponent />;
       default:
         return <HomeScreen />;
     }

src/services/authService.ts

@@ -150,6 +150,9 @@ class AuthService {
   async login(data: LoginRequest): Promise<AuthResponse> {
     const response = await api.post<AuthResponse>('/auth/login', data);
 
+    if (!response.data) {
+      throw new Error('登录响应数据为空');
+    }
     if (response.data.token) {
       await api.setToken(response.data.token);
     }
@@ -165,6 +168,9 @@ class AuthService {
   async register(data: RegisterRequest): Promise<AuthResponse> {
     const response = await api.post<AuthResponse>('/auth/register', data);
 
+    if (!response.data) {
+      throw new Error('注册响应数据为空');
+    }
     if (response.data.token) {
       await api.setToken(response.data.token);
     }
@@ -233,6 +239,9 @@ class AuthService {
     try {
       const response = await api.post<RefreshTokenResponse>('/auth/refresh');
       
+      if (!response.data) {
+        return null;
+      }
       if (response.data.token) {
         await api.setToken(response.data.token);
       }

src/services/postService.ts

@@ -287,19 +287,17 @@ class PostService {
 
   /**
    * 获取帖子列表（游标分页）
-   * GET /api/v1/posts/cursor
+   * GET /api/v1/posts
    * @param params 游标分页请求参数（包含 post_type 可选：recommend, follow, hot, latest）
    */
    async getPostsCursor(
      params: CursorPaginationRequest = {}
    ): Promise<CursorPaginationResponse<Post>> {
      try {
-      const response = await api.get<CursorPaginationResponse<Post>>('/posts/cursor', {
-        params: {
+       const response = await api.get<CursorPaginationResponse<Post>>('/posts', {
         cursor: params.cursor,
         page_size: params.page_size,
         post_type: params.post_type,
-        },
       });
       return response.data;
     } catch (error) {
@@ -315,7 +313,7 @@ class PostService {
 
   /**
    * 搜索帖子（游标分页）
-   * GET /api/v1/posts/search/cursor
+   * GET /api/v1/posts/search
    * @param query 搜索关键词
    * @param params 游标分页请求参数
    */
@@ -324,11 +322,9 @@ class PostService {
     params: CursorPaginationRequest = {}
   ): Promise<CursorPaginationResponse<Post>> {
     try {
-      const response = await api.get<CursorPaginationResponse<Post>>('/posts/search/cursor', {
-        params: {
+      const response = await api.get<CursorPaginationResponse<Post>>('/posts/search', {
         ...params,
         keyword: query,
-        },
       });
       return response.data;
     } catch (error) {
@@ -344,7 +340,7 @@ class PostService {
 
   /**
    * 获取用户帖子列表（游标分页）
-   * GET /api/v1/users/:id/posts/cursor
+   * GET /api/v1/users/:id/posts
    * @param userId 用户ID
    * @param params 游标分页请求参数
    */
@@ -354,8 +350,8 @@ class PostService {
   ): Promise<CursorPaginationResponse<Post>> {
     try {
       const response = await api.get<CursorPaginationResponse<Post>>(
-        `/users/${userId}/posts/cursor`,
-        { params }
+        `/users/${userId}/posts`,
+        params
       );
       return response.data;
     } catch (error) {