refactor(Post, PostMapper, PostRepository, CreatePostScreen, HomeScreen): update communityId to channelId for improved clarity

- Renamed communityId to channelId across Post entity, PostMapper, and PostRepository for consistency and clarity.
- Updated CreatePostScreen to include channel selection functionality, enhancing user experience when creating posts.
- Adjusted HomeScreen to support filtering posts by channel, improving content organization.
- Refactored related interfaces and services to align with the new channelId terminology, ensuring a cohesive codebase.

src/services/api.ts

@@ -8,6 +8,7 @@
 import AsyncStorage from '@react-native-async-storage/async-storage';
 import { CommonActions } from '@react-navigation/native';
 import Constants from 'expo-constants';
+import { Platform } from 'react-native';
 
 // 生产地址 https://bbs.littlelan.cn
 const getBaseUrl = () => {
@@ -381,12 +382,20 @@ class ApiClient {
   ): Promise<ApiResponse<T>> {
     const formData = new FormData();
     
-    // 添加文件（使用image字段名）
-    formData.append('image', {
-      uri: file.uri,
-      name: file.name,
-      type: file.type,
-    } as any);
+    // 添加文件（使用 image 字段名）
+    // Web 端需要 append Blob/File；原生端可以直接传 { uri, name, type }。
+    if (Platform.OS === 'web') {
+      const fileResponse = await fetch(file.uri);
+      const blob = await fileResponse.blob();
+      const uploadFile = new File([blob], file.name, { type: file.type || blob.type || 'application/octet-stream' });
+      formData.append('image', uploadFile);
+    } else {
+      formData.append('image', {
+        uri: file.uri,
+        name: file.name,
+        type: file.type,
+      } as any);
+    }
 
     // 添加额外数据
     if (additionalData) {

src/services/channelService.ts

@@ -0,0 +1,29 @@
+import { api } from './api';
+
+export interface ChannelItem {
+  id: string;
+  name: string;
+  slug: string;
+  description?: string;
+  sort_order: number;
+  is_active: boolean;
+}
+
+interface ChannelListResponse {
+  list: ChannelItem[];
+}
+
+class ChannelService {
+  async list(): Promise<ChannelItem[]> {
+    try {
+      const res = await api.get<ChannelListResponse>('/channels');
+      return res.data?.list || [];
+    } catch (error) {
+      console.error('[channelService] 获取频道失败:', error);
+      return [];
+    }
+  }
+}
+
+export const channelService = new ChannelService();
+

src/services/index.ts

@@ -44,6 +44,8 @@ export { pushService, registerDevice, getDevices, unregisterDevice, updateDevice
 
 // 投票服务
 export { voteService } from './voteService';
+export { channelService } from './channelService';
+export type { ChannelItem } from './channelService';
 
 // SSE 实时服务
 export { sseService } from './sseService';

src/services/postService.ts

@@ -29,6 +29,7 @@ interface CreatePostRequest {
   title: string;
   content: string;
   images?: string[];
+  channel_id?: string;
 }
 
 // 更新帖子请求
@@ -45,7 +46,7 @@ class PostService {
     page = 1,
     pageSize = 20,
     tab?: string,
-    communityId?: string
+    channelId?: string
   ): Promise<PaginatedData<Post>> {
     const params: Record<string, any> = {
       page,
@@ -55,8 +56,8 @@ class PostService {
     if (tab) {
       params.tab = tab;
     }
-    if (communityId) {
-      params.community_id = communityId;
+    if (channelId) {
+      params.channel_id = channelId;
     }
     
     const response = await api.get<PostListResponse>('/posts', params);