refactor(post): consolidate post sync to PostSyncService and remove ProcessPostUseCase

- Replace ProcessPostUseCase with new PostSyncService in src/services/post/
- Add postListStore for state management in src/stores/post/
- Remove deprecated ProcessPostUseCase and ProcessMessageUseCase files
- Delete architecture documentation files (ARCHITECTURE_REFACTOR_PLAN.md, architecture-comparison-report.md)
- Update all consumers (HomeScreen, PostDetailScreen, SearchScreen, useUserProfile, useDifferentialPosts)
- Simplify postService to only contain API layer methods
- Remove unused type exports from message stores

BREAKING CHANGE: ProcessPostUseCase and ProcessMessageUseCase have been removed.
Use postSyncService for post operations instead.

src/screens/home/HomeScreen.tsx

@@ -34,7 +34,7 @@ import type { PostCardAction } from '../../components/business/PostCard';
 import { Loading, EmptyState, Text, ImageGallery, ImageGridItem, ResponsiveGrid } from '../../components/common';
 import { useResponsive, useResponsiveSpacing } from '../../hooks/useResponsive';
 import { useDifferentialPosts } from '../../hooks/useDifferentialPosts';
-import { processPostUseCase } from '../../core/usecases/ProcessPostUseCase';
+import { postSyncService } from '../../services/post/PostSyncService';
 import { SearchScreen } from './SearchScreen';
 import { CreatePostScreen } from '../create/CreatePostScreen';
 import * as hrefs from '../../navigation/hrefs';
@@ -375,7 +375,7 @@ export const HomeScreen: React.FC = () => {
       isLoadingMoreRef.current = true;
       const startedAt = Date.now();
       try {
-        await processPostUseCase.loadMorePosts(listKey);
+        await postSyncService.loadMorePosts(listKey);
         console.log('[PostPerf] home loadMore', {
           listKey,
           costMs: Date.now() - startedAt,
@@ -409,7 +409,7 @@ export const HomeScreen: React.FC = () => {
   const refresh = useCallback(async () => {
     try {
       // 先获取正确类型的帖子
-      await processPostUseCase.fetchPosts(
+      await postSyncService.fetchPosts(
         {
           page: 1,
           pageSize: DEFAULT_PAGE_SIZE,
@@ -554,9 +554,9 @@ export const HomeScreen: React.FC = () => {
   const handleLike = async (post: Post) => {
     try {
       if (post.is_liked) {
-        await processPostUseCase.unlikePost(post.id);
+        await postSyncService.unlikePost(post.id);
       } else {
-        await processPostUseCase.likePost(post.id);
+        await postSyncService.likePost(post.id);
       }
     } catch (error) {
       console.error('点赞操作失败:', error);
@@ -567,9 +567,9 @@ export const HomeScreen: React.FC = () => {
   const handleBookmark = async (post: Post) => {
     try {
       if (post.is_favorited) {
-        await processPostUseCase.unfavoritePost(post.id);
+        await postSyncService.unfavoritePost(post.id);
       } else {
-        await processPostUseCase.favoritePost(post.id);
+        await postSyncService.favoritePost(post.id);
       }
     } catch (error) {
       console.error('收藏操作失败:', error);
@@ -582,7 +582,7 @@ export const HomeScreen: React.FC = () => {
     try {
       const res = await postService.sharePost(post.id, { channel: 'copy_link' });
       if (res.ok && res.shares_count != null) {
-        processPostUseCase.applyShareCountUpdate(post.id, res.shares_count);
+        postSyncService.applyShareCountUpdate(post.id, res.shares_count);
       }
     } catch (shareError) {
       console.error('上报分享次数失败:', shareError);