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/data/repositories/interfaces/IPostRepository.ts

@@ -19,8 +19,8 @@ export interface GetPostsParams {
   cursor?: string;
   /** 帖子类型筛选（可选）：follow, hot, latest */
   post_type?: 'follow' | 'hot' | 'latest';
-  /** 社区ID过滤 */
-  communityId?: string;
+  /** 频道ID过滤 */
+  channelId?: string;
   /** 作者ID过滤 */
   authorId?: string;
   /** 标签过滤 */
@@ -45,8 +45,8 @@ export interface CreatePostData {
   content: string;
   /** 图片列表 */
   images?: PostImage[];
-  /** 所属社区ID */
-  communityId?: string;
+  /** 所属频道ID */
+  channelId?: string;
   /** 标签列表 */
   tags?: string[];
   /** 帖子状态 */
@@ -97,8 +97,8 @@ export interface SearchPostsParams {
   pageSize?: number;
   /** 搜索范围：标题、内容、或全部 */
   scope?: 'title' | 'content' | 'all';
-  /** 社区ID过滤 */
-  communityId?: string;
+  /** 频道ID过滤 */
+  channelId?: string;
 }
 
 // ==================== Repository 接口 ====================