refactor(MessageManager): enhance conversation list handling and integrate local source fallback

- Update MessageManager to support both remote and local conversation list sources, improving data retrieval and offline capabilities.
- Refactor hooks and components to utilize the new MessageManager structure, ensuring seamless integration of cursor pagination and local caching.
- Introduce new types and methods for better management of conversation data and loading states.
- Modify MessageListScreen to leverage the updated hooks for fetching conversations, enhancing user experience with improved loading and pagination handling.

src/stores/index.ts

@@ -14,7 +14,22 @@ export {
 
 // MessageManager 新架构导出（已替换 conversationStore）
 export { messageManager } from './messageManager';
-export type { MessageEvent, MessageEventType, MessageSubscriber } from './messageManager';
+export type {
+  MessageEvent,
+  MessageEventType,
+  MessageSubscriber,
+  MessageManagerConversationListDeps,
+} from './messageManager';
+export {
+  CONVERSATION_LIST_PAGE_SIZE,
+  type ConversationListPage,
+  type IConversationListPagedSource,
+  type RemoteConversationListSourceKind,
+  NetworkCursorConversationListPagedSource,
+  NetworkOffsetConversationListPagedSource,
+  SqliteConversationListPagedSource,
+  createRemoteConversationListSource,
+} from './conversationListSources';
 export { postManager } from './postManager';
 export { groupManager } from './groupManager';
 export { userManager } from './userManager';