refactor(database): migrate to new modular database layer and unify data access

- Remove legacy database.ts, LocalDataSource.ts, and MessageRepository.ts
- Create new src/database/ module with messageRepository, userCacheRepository, conversationRepository, and groupCacheRepository
- Update all consumers to import from @/database instead of services/database
- Add web platform blur handling for modal components to fix focus issues
- Flatten SystemMessageItem and NotificationsScreen styles for consistent design
- Add draggable slider in ChatSettingsScreen and dynamic font size support
- Introduce 9 new chat color themes
- Add profile screens for about, terms, and privacy policy with navigation routes
- Add policy links to login and registration screens
- Fix post share URL format from /posts/ to /post/

src/stores/groupListSources.ts

@@ -10,7 +10,7 @@ import {
   CursorPaginationRequest,
 } from '../types/dto';
 import { groupService } from '../services/groupService';
-import { getAllGroupsCache, getGroupMembersCache } from '../services/database';
+import { groupCacheRepository } from '@/database';
 
 export const GROUP_LIST_PAGE_SIZE = 20;
 export const GROUP_MEMBER_LIST_PAGE_SIZE = 50;
@@ -130,7 +130,7 @@ export class SqliteGroupListPagedSource implements IGroupListPagedSource {
     }
     this.consumed = true;
     try {
-      const items = await getAllGroupsCache();
+      const items = await groupCacheRepository.getAll();
       return { items, hasMore: false };
     } catch (e) {
       console.warn('[SqliteGroupListPagedSource] 读取群组列表缓存失败:', e);
@@ -265,7 +265,7 @@ export class SqliteGroupMemberListPagedSource implements IGroupMemberListPagedSo
     }
     this.consumed = true;
     try {
-      const items = await getGroupMembersCache(this.groupId);
+      const items = await groupCacheRepository.getMembers(this.groupId);
       return { items, hasMore: false };
     } catch (e) {
       console.warn('[SqliteGroupMemberListPagedSource] 读取成员列表缓存失败:', e);