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/components/business/CommentItem.tsx

@@ -6,8 +6,7 @@
 import React, { useMemo, useState } from 'react';
 import { View, TouchableOpacity, StyleSheet, Alert } from 'react-native';
 import { MaterialCommunityIcons } from '@expo/vector-icons';
-import { formatDistanceToNow } from 'date-fns';
-import { zhCN } from 'date-fns/locale';
+import { formatChatTime } from '../../utils/formatTime';
 import { spacing, borderRadius, fontSizes, useAppColors, type AppColors } from '../../theme';
 import { Comment, CommentImage } from '../../types';
 import Text from '../common/Text';
@@ -220,20 +219,6 @@ const CommentItem: React.FC<CommentItemProps> = ({
   const colors = useAppColors();
   const styles = useMemo(() => createCommentItemStyles(colors), [colors]);
   const [isDeleting, setIsDeleting] = useState(false);
-  // 格式化时间
-  const formatTime = (dateString: string): string => {
-    if (!dateString) return '';
-    try {
-      const date = new Date(dateString);
-      if (Number.isNaN(date.getTime())) return '';
-      return formatDistanceToNow(date, {
-        addSuffix: true,
-        locale: zhCN,
-      });
-    } catch {
-      return '';
-    }
-  };
 
   // 格式化数字
   const formatNumber = (num: number): string => {
@@ -599,7 +584,7 @@ const CommentItem: React.FC<CommentItemProps> = ({
             {renderBadges()}
             <Text style={styles.metaDot}>·</Text>
             <Text variant="caption" color={colors.text.hint} style={styles.timeText}>
-              {formatTime(comment.created_at || '')}
+              {formatChatTime(comment.created_at || '')}
             </Text>
           </View>
           {renderFloorNumber()}

src/components/business/PostCard/PostCard.tsx

@@ -24,7 +24,7 @@ import { spacing, borderRadius, fontSizes, useAppColors, type AppColors } from '
 import { getPreviewImageUrl } from '../../../utils/imageHelper';
 import PostImages from './components/PostImages';
 import PostContentRenderer from '../PostContentRenderer';
-import { useResponsive } from '../../../hooks/useResponsive';
+import { useResponsive } from '../../../hooks';
 import { formatPostCreatedAtString } from '../../../core/entities/Post';
 
 /** 列表相对时间：独立定时刷新，避免外层 PostCard.memo 挡住「分钟前」更新 */

src/components/business/PostCard/components/PostImages.tsx

@@ -6,7 +6,7 @@
 import React from 'react';
 import { View, StyleSheet } from 'react-native';
 import { spacing, borderRadius } from '../../../../theme';
-import { useResponsive } from '../../../../hooks/useResponsive';
+import { useResponsive } from '../../../../hooks';
 import { ImageGrid, ImageGridItem } from '../../../common';
 import { PostImagesProps } from '../types';
 

src/components/business/SystemMessageItem.tsx

@@ -7,8 +7,7 @@
 import React, { useMemo } from 'react';
 import { View, TouchableOpacity, StyleSheet } from 'react-native';
 import { MaterialCommunityIcons } from '@expo/vector-icons';
-import { formatDistanceToNow } from 'date-fns';
-import { zhCN } from 'date-fns/locale';
+import { formatChatTime } from '../../utils/formatTime';
 import { spacing, borderRadius, fontSizes, useAppColors, type AppColors } from '../../theme';
 import { SystemMessageResponse, SystemMessageType } from '../../types/dto';
 import Text from '../common/Text';
@@ -329,21 +328,6 @@ const SystemMessageItem: React.FC<SystemMessageItemProps> = ({
   const colors = useAppColors();
   const styles = useMemo(() => createSystemMessageStyles(colors), [colors]);
 
-  // 格式化时间
-  const formatTime = (dateString: string): string => {
-    if (!dateString) return '';
-    try {
-      const date = new Date(dateString);
-      if (Number.isNaN(date.getTime())) return '';
-      return formatDistanceToNow(date, {
-        addSuffix: true,
-        locale: zhCN,
-      });
-    } catch {
-      return '';
-    }
-  };
-
   const { icon, color, bgColor } = getSystemMessageIcon(message.system_type, colors);
   const title = getSystemMessageTitle(message);
   const { extra_data } = message;
@@ -444,7 +428,7 @@ const SystemMessageItem: React.FC<SystemMessageItemProps> = ({
             {getStatusBadge()}
           </View>
           <Text variant="caption" color={colors.text.hint} style={styles.time}>
-            {formatTime(message.created_at)}
+            {formatChatTime(message.created_at)}
           </Text>
         </View>