refactor: restructure core architecture and responsive system

This commit implements a major architectural refactor to improve modularity, type safety, and maintainability across the codebase.

Key changes include:
- **Responsive System Refactor**: Migrated from a monolithic `useResponsive` hook to a set of specialized, granular hooks (`useBreakpoint`, `useOrientation`, `usePlatform`, etc.) located in `src/presentation/hooks/responsive`. This reduces unnecessary re-renders and improves developer experience.
- **Core Service Restructuring**: Introduced a new directory structure for services, including dedicated folders for `datasources`, `mappers`, and domain-specific types (`message`, `post`).
- **Data Layer Improvements**:
    - Centralized JSON parsing logic in `src/database/core/jsonUtils.ts`.
    - Cleaned up repository implementations by removing redundant local utility functions.
    - Refactored `MessageMapper` to use the new centralized JSON utility.
- **Type System Cleanup**:
    - Decomposed the large `src/types/dto.ts` into a modular `src/types/dto/` directory.
    - Simplified `src/types/index.ts` and introduced backward-compatible aliases for core entities.
- **Utility Consolidation**:
    - Created a centralized `src/utils/formatTime.ts` to replace fragmented date formatting logic across various screens and components.
    - Removed deprecated responsive utility files in favor of the new hook-based system.
- **Service Logic Refinement**: Refactored `ApiClient` and `WebSocketService` to use a centralized `showVerificationModal` service, removing duplicated state management for verification prompts.

src/data/models/index.ts

@@ -124,32 +124,3 @@ export interface GroupModel {
   updatedAt: Date;
 }
 
-// ==================== 分页模型 ====================
-
-export interface PaginatedResult<T> {
-  list: T[];
-  total: number;
-  page: number;
-  pageSize: number;
-  totalPages: number;
-  hasMore: boolean;
-}
-
-// ==================== 通用操作结果 ====================
-
-export interface OperationResult<T = void> {
-  success: boolean;
-  data?: T;
-  error?: string;
-  code?: string;
-}
-
-// ==================== 同步状态模型 ====================
-
-export interface SyncStatus {
-  entityType: string;
-  entityId: string;
-  lastSyncedAt: Date;
-  syncVersion: number;
-  pendingChanges: boolean;
-}