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/core/usecases/ProcessMessageUseCase.ts

@@ -4,7 +4,7 @@
  * 纯业务逻辑，无UI依赖
  */
 
-import { messageRepository } from '../../data/repositories/MessageRepository';
+import { messageRepository, userCacheRepository, CachedMessage } from '@/database';
 import { wsClient, WSEventType } from '../../data/datasources/WSClient';
 import {
   Message,
@@ -18,6 +18,16 @@ import {
 import { messageService } from '../../services/messageService';
 import { api } from '../../services/api';
 
+const cachedMessageToMessage = (cached: CachedMessage): Message => ({
+  id: cached.id,
+  conversationId: cached.conversationId,
+  senderId: cached.senderId,
+  seq: cached.seq,
+  segments: cached.segments || [],
+  createdAt: cached.createdAt,
+  status: cached.status as Message['status'],
+});
+
 // 事件类型定义
 export type MessageUseCaseEventType =
   | 'message_received'
@@ -182,7 +192,16 @@ class ProcessMessageUseCase {
 
     // 异步保存到本地数据库
     const isRead = _isAck || sender_id === this.currentUserId;
-    messageRepository.saveMessage(newMessage, isRead).catch((error) => {
+    messageRepository.saveMessage({
+      id: newMessage.id,
+      conversationId: newMessage.conversationId,
+      senderId: newMessage.senderId,
+      seq: newMessage.seq,
+      segments: newMessage.segments,
+      createdAt: newMessage.createdAt,
+      status: newMessage.status || 'normal',
+      isRead,
+    }).catch((error) => {
       console.error('[ProcessMessageUseCase] 保存消息失败:', error);
     });
 
@@ -227,7 +246,7 @@ class ProcessMessageUseCase {
    */
   private async getSenderInfo(userId: string): Promise<any | null> {
     // 先检查本地缓存
-    const cachedUser = await messageRepository.getUserCache(userId);
+    const cachedUser = await userCacheRepository.get(userId);
     if (cachedUser) {
       return cachedUser;
     }
@@ -255,9 +274,9 @@ class ProcessMessageUseCase {
    */
   private async fetchUserInfo(userId: string): Promise<any | null> {
     try {
-      const response = await api.get(`/users/${userId}`);
+      const response = await api.get<any>(`/users/${userId}`);
       if (response.code === 0 && response.data) {
-        await messageRepository.saveUserCache(response.data);
+        await userCacheRepository.save(response.data as any);
         return response.data;
       }
       return null;
@@ -322,8 +341,8 @@ class ProcessMessageUseCase {
 
     // 更新本地数据库状态
     messageRepository
-      .updateMessageStatus(message_id, 'recalled', true)
-      .catch((error) => {
+      .updateStatus(message_id, 'recalled', true)
+      .catch((error: unknown) => {
         console.error('[ProcessMessageUseCase] 更新撤回状态失败:', error);
       });
 
@@ -349,8 +368,8 @@ class ProcessMessageUseCase {
 
     // 更新本地数据库状态
     messageRepository
-      .updateMessageStatus(message_id, 'recalled', true)
-      .catch((error) => {
+      .updateStatus(message_id, 'recalled', true)
+      .catch((error: unknown) => {
         console.error('[ProcessMessageUseCase] 更新撤回状态失败:', error);
       });
 
@@ -506,7 +525,16 @@ class ProcessMessageUseCase {
         });
 
         // 保存到本地数据库
-        await messageRepository.saveMessage(message, true);
+        await messageRepository.saveMessage({
+          id: message.id,
+          conversationId: message.conversationId,
+          senderId: message.senderId,
+          seq: message.seq,
+          segments: message.segments,
+          createdAt: message.createdAt,
+          status: message.status || 'normal',
+          isRead: true,
+        });
 
         return message;
       }
@@ -522,7 +550,8 @@ class ProcessMessageUseCase {
    * 获取本地消息
    */
   async getLocalMessages(conversationId: string, limit: number = 20): Promise<Message[]> {
-    return messageRepository.getMessagesByConversation(conversationId, limit);
+    const cached = await messageRepository.getByConversation(conversationId, limit);
+    return cached.map(cachedMessageToMessage);
   }
 
   /**
@@ -534,14 +563,14 @@ class ProcessMessageUseCase {
     limit: number = 20
   ): Promise<Message[]> {
     // 先从本地获取
-    const localMessages = await messageRepository.getMessagesBeforeSeq(
+    const localMessages = await messageRepository.getBeforeSeq(
       conversationId,
       beforeSeq,
       limit
     );
 
     if (localMessages.length >= limit) {
-      return localMessages;
+      return localMessages.map(cachedMessageToMessage);
     }
 
     // 本地数据不足，从服务端获取
@@ -567,7 +596,16 @@ class ProcessMessageUseCase {
         );
 
         // 保存到本地
-        await messageRepository.saveMessages(serverMessages, false);
+        await messageRepository.saveMessagesBatch(serverMessages.map((m: any) => ({
+          id: m.id,
+          conversationId: m.conversation_id || conversationId,
+          senderId: m.sender_id,
+          seq: m.seq,
+          segments: m.segments || [],
+          createdAt: m.created_at,
+          status: m.status || 'normal',
+          isRead: false,
+        })));
 
         return serverMessages;
       }
@@ -575,7 +613,7 @@ class ProcessMessageUseCase {
       console.error('[ProcessMessageUseCase] 获取历史消息失败:', error);
     }
 
-    return localMessages;
+    return localMessages.map(cachedMessageToMessage);
   }
 
   /**
@@ -602,7 +640,16 @@ class ProcessMessageUseCase {
         );
 
         // 保存到本地
-        await messageRepository.saveMessages(messages, false);
+        await messageRepository.saveMessagesBatch(messages.map((m: any) => ({
+          id: m.id,
+          conversationId: m.conversation_id || conversationId,
+          senderId: m.sender_id,
+          seq: m.seq,
+          segments: m.segments || [],
+          createdAt: m.created_at,
+          status: m.status || 'normal',
+          isRead: false,
+        })));
 
         return messages;
       }