feat(Notification): implement notification preferences management and enhance notification handling

- Introduced a new service for managing notification preferences, including push notifications, sound, and vibration settings.
- Updated the notification handling logic to respect user preferences, ensuring notifications are displayed according to user settings.
- Refactored the App and various screens to integrate the new notification preferences, improving user experience and consistency.
- Enhanced the HomeScreen and NotificationSettingsScreen to load and update notification settings seamlessly.
- Implemented a mechanism to hide the bottom tab bar based on scroll events, improving navigation usability.

src/core/entities/Post.ts

@@ -77,6 +77,8 @@ export interface Post {
   status: PostStatus;
   /** 所属频道ID */
   channelId?: string;
+  /** 频道摘要（列表 API 填充，供 PostCard 等展示） */
+  channel?: { id: string; name: string } | null;
   /** 标签列表 */
   tags: string[];
   /** 创建时间 */