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/screens/home/PostDetailScreen.tsx

@@ -43,8 +43,9 @@ import { postSyncService } from '@/services/post';
 import { useCursorPagination } from '../../hooks/useCursorPagination';
 import { CommentItem, VoteCard, ReportDialog, ShareSheet, PostContentRenderer, PostMentionInput } from '../../components/business';
 import { Avatar, Button, Loading, EmptyState, Text, ImageGallery, ImageGrid, ImageGridItem, AdaptiveLayout, AppBackButton } from '../../components/common';
-import { useResponsive, useResponsiveValue, useResponsiveSpacing } from '../../hooks/useResponsive';
+import { useResponsive, useResponsiveValue, useResponsiveSpacing } from '../../hooks';
 import { handleError } from '@/services/core';
+import { formatDateTime as formatDateTimeUtil, formatRelativeTime as formatRelativeTimeUtil } from '@/utils/formatTime';
 import * as hrefs from '../../navigation/hrefs';
 
 const EMOJIS = [
@@ -458,37 +459,9 @@ export const PostDetailScreen: React.FC = () => {
     });
   }, [comments.length, loadMoreComments, postId]);
 
-  const formatDateTime = (dateString?: string | null): string => {
-    if (!dateString) return '';
-    const date = new Date(dateString);
-    if (Number.isNaN(date.getTime())) return '';
-    const pad = (num: number) => String(num).padStart(2, '0');
-    return `${pad(date.getMonth() + 1)}-${pad(date.getDate())} ${pad(date.getHours())}:${pad(date.getMinutes())}`;
-  };
+  const formatDateTime = (dateString?: string | null): string => formatDateTimeUtil(dateString);
 
-  const formatRelativeTime = (dateString?: string | null): string => {
-    if (!dateString) return '';
-    const date = new Date(dateString);
-    if (Number.isNaN(date.getTime())) return '';
-
-    const now = Date.now();
-    const diffMs = now - date.getTime();
-    if (diffMs < 0) return formatDateTime(dateString);
-
-    const minuteMs = 60 * 1000;
-    const hourMs = 60 * minuteMs;
-    const dayMs = 24 * hourMs;
-
-    if (diffMs < minuteMs) return '刚刚';
-    if (diffMs < hourMs) return `${Math.floor(diffMs / minuteMs)}分钟前`;
-    if (diffMs < dayMs) return `${Math.floor(diffMs / hourMs)}小时前`;
-    if (diffMs < 2 * dayMs) {
-      const pad = (num: number) => String(num).padStart(2, '0');
-      return `昨天 ${pad(date.getHours())}:${pad(date.getMinutes())}`;
-    }
-
-    return formatDateTime(dateString);
-  };
+  const formatRelativeTime = (dateString?: string | null): string => formatRelativeTimeUtil(dateString);
 
   const getPostEditedDisplayAt = (
     createdAt?: string | null,