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/screens/message/components/ConversationListRow.tsx

@@ -14,7 +14,7 @@ import {
   MessageSegment,
 } from '../../../types/dto';
 import { authService } from '../../../services';
-import { getUserCache } from '../../../services/database';
+import { userCacheRepository } from '@/database';
 import { Avatar, Text } from '../../../components/common';
 
 const AnimatedTouchable = Animated.createAnimatedComponent(TouchableOpacity);
@@ -62,7 +62,7 @@ const AsyncMessagePreview: React.FC<{
         try {
           const asyncText = await extractTextFromSegmentsAsync(
             segments,
-            getUserCache,
+            userCacheRepository.get.bind(userCacheRepository),
             authService.getUserById.bind(authService)
           );
           if (isMountedRef.current && asyncText !== initialText) {