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/stores/post/postStore.ts

@@ -1,66 +1,40 @@
-/**
- * 帖子状态 Zustand Store
- */
-
 import { create } from 'zustand';
 import type { Post } from '../../types';
 import { CacheEntry, createCacheEntry, isCacheExpired, DEFAULT_TTL } from '../utils/cache';
 
-// ==================== 状态接口 ====================
-
 export interface PostManagerState {
-  // 帖子列表缓存 (key: list:type:page:pageSize)
   listsMap: Map<string, CacheEntry<Post[]>>;
-
-  // 帖子详情缓存
   detailsMap: Map<string, CacheEntry<Post | null>>;
-
-  // 加载状态
   loadingListKeys: Set<string>;
   loadingDetailIds: Set<string>;
-
-  // 待处理请求（去重）
   pendingRequests: Map<string, Promise<any>>;
 }
 
 export interface PostManagerActions {
-  // 获取状态
   getPostsList: (type: string, page: number, pageSize: number) => Post[] | null;
   getPostDetail: (postId: string) => Post | null;
   isListExpired: (type: string, page: number, pageSize: number) => boolean;
   isDetailExpired: (postId: string) => boolean;
   isLoadingList: (type: string, page: number, pageSize: number) => boolean;
   isLoadingDetail: (postId: string) => boolean;
-
-  // 设置状态
   setPostsList: (type: string, page: number, pageSize: number, posts: Post[]) => void;
   setPostDetail: (postId: string, post: Post | null) => void;
   setLoadingList: (type: string, page: number, pageSize: number, loading: boolean) => void;
   setLoadingDetail: (postId: string, loading: boolean) => void;
-
-  // 缓存管理
   invalidateList: (type?: string, page?: number, pageSize?: number) => void;
   invalidateDetail: (postId: string) => void;
   invalidateAll: () => void;
-
-  // 请求去重
   getPendingRequest: <T>(key: string) => Promise<T> | undefined;
   setPendingRequest: <T>(key: string, request: Promise<T>) => void;
   deletePendingRequest: (key: string) => void;
   clearPendingRequests: () => void;
-
-  // 重置
   reset: () => void;
 }
 
-// ==================== 辅助函数 ====================
-
 function buildListKey(type: string, page: number, pageSize: number): string {
   return `list:${type}:${page}:${pageSize}`;
 }
 
-// ==================== 初始状态 ====================
-
 const initialState: PostManagerState = {
   listsMap: new Map(),
   detailsMap: new Map(),
@@ -69,16 +43,11 @@ const initialState: PostManagerState = {
   pendingRequests: new Map(),
 };
 
-// ==================== Store 创建 ====================
-
 export type PostManagerStore = PostManagerState & PostManagerActions;
 
 export const usePostManagerStore = create<PostManagerStore>((set, get) => ({
-  // ==================== 初始状态 ====================
   ...initialState,
 
-  // ==================== 获取状态 ====================
-
   getPostsList: (type: string, page: number, pageSize: number) => {
     const key = buildListKey(type, page, pageSize);
     const entry = get().listsMap.get(key);
@@ -116,8 +85,6 @@ export const usePostManagerStore = create<PostManagerStore>((set, get) => ({
     return get().loadingDetailIds.has(postId);
   },
 
-  // ==================== 设置状态 ====================
-
   setPostsList: (type: string, page: number, pageSize: number, posts: Post[]) => {
     const key = buildListKey(type, page, pageSize);
     set(state => {
@@ -160,8 +127,6 @@ export const usePostManagerStore = create<PostManagerStore>((set, get) => ({
     });
   },
 
-  // ==================== 缓存管理 ====================
-
   invalidateList: (type?: string, page?: number, pageSize?: number) => {
     if (type !== undefined && page !== undefined && pageSize !== undefined) {
       const key = buildListKey(type, page, pageSize);
@@ -191,8 +156,6 @@ export const usePostManagerStore = create<PostManagerStore>((set, get) => ({
     });
   },
 
-  // ==================== 请求去重 ====================
-
   getPendingRequest: <T>(key: string) => {
     return get().pendingRequests.get(key) as Promise<T> | undefined;
   },
@@ -217,8 +180,6 @@ export const usePostManagerStore = create<PostManagerStore>((set, get) => ({
     set({ pendingRequests: new Map() });
   },
 
-  // ==================== 重置 ====================
-
   reset: () => {
     set({
       ...initialState,