refactor(message): modularize MessageManager architecture

重构消息管理模块，将单体 MessageManager 拆分为职责单一的子模块：

- MessageStateManager: 纯状态管理
- MessageDeduplication: 消息去重服务
- UserCacheService: 用户缓存服务
- ReadReceiptManager: 已读回执管理
- ConversationOperations: 会话操作
- MessageSendService: 消息发送
- MessageSyncService: 消息同步
- WSMessageHandler: WebSocket 消息处理

新增类型定义和常量文件，保持原有 API 向后兼容。修复 CallScreen 状态值错误，补充 PostDetailScreen 缺失样式，优化 GroupInfoPanel 导入。

src/screens/message/components/ChatScreen/GroupInfoPanel.web.tsx

@@ -17,7 +17,7 @@ import {
 } from 'react-native';
 import { MaterialCommunityIcons } from '@expo/vector-icons';
 import { Avatar, Text } from '../../../../components/common';
-import { useAppColors, spacing, fontSizes, shadows, type AppColors } from '../../../../theme';
+import { useAppColors, spacing, fontSizes, shadows, borderRadius, type AppColors } from '../../../../theme';
 import { GroupMemberResponse, GroupResponse, GroupAnnouncementResponse } from '../../../../types/dto';
 import { useBreakpointGTE } from '../../../../hooks/useResponsive';
 import { groupManager } from '../../../../stores/groupManager';