feat(Apps): introduce Apps tab and related screens for enhanced navigation

- Added a new "Apps" tab in the TabsLayout, providing users with access to various applications.
- Created AppsScreen to display app entries, including a schedule feature with a calendar icon.
- Implemented routing for the schedule and course screens under the new Apps tab structure.
- Updated navigation hrefs to reflect the new Apps section, improving overall user experience.
- Refactored HomeScreen to manage bottom tab visibility based on scroll events, enhancing usability.

src/types/dto.ts

@@ -57,6 +57,12 @@ export interface PostImageDTO {
   height: number;
 }
 
+/** 帖子所属频道（列表卡片展示） */
+export interface PostChannelBriefDTO {
+  id: string;
+  name: string;
+}
+
 export interface PostDTO {
   id: string;
   user_id: string;
@@ -81,6 +87,8 @@ export interface PostDTO {
   is_favorited: boolean;
   // 额外字段
   channel_id?: string;
+  /** 频道摘要（与 channel_id 对应，服务端批量填充） */
+  channel?: PostChannelBriefDTO | null;
   top_comment?: CommentDTO | null;
 }