🐛 修复视频播放器无限循环渲染问题

## 主要修复
- 修复 FullscreenMediaModal 和 FullscreenVideoModal 中的 useEffect 循环依赖
- 重构 VideoPlayer 组件的视频属性管理逻辑
- 优化 useVideoPlayer 的初始化回调机制

## 新增功能
- 新增标签 API 支持 (lib/api/tags.ts)
- 新增内容骨架屏组件 (components/profile/content-skeleton.tsx)
- 新增返回按钮组件 (components/ui/back-button.tsx)

## 改进优化
- 优化视频播放器的性能，避免重复初始化
- 修复 useEffect 依赖项导致的无限循环更新
- 完善类型定义和 API 接口

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

types/expo-video-migration.d.ts

@@ -0,0 +1,49 @@
+// 迁移类型定义 - 兼容 expo-av 到 expo-video 的迁移
+import { Video } from 'expo-video';
+
+export type { Video };
+
+// ResizeMode 映射
+export const ResizeMode = {
+  CONTAIN: 'contain' as const,
+  COVER: 'cover' as const,
+  STRETCH: 'stretch' as const,
+};
+
+export type ResizeMode = 'contain' | 'cover' | 'stretch';
+
+// 兼容性类型
+export interface AVPlaybackStatus {
+  isLoaded: boolean;
+  isPlaying?: boolean;
+  durationMillis?: number;
+  naturalSize?: {
+    width: number;
+    height: number;
+  };
+  positionMillis?: number;
+}
+
+export interface VideoReadyForDisplayEvent {
+  nativeEvent: {
+    naturalSize: {
+      width: number;
+      height: number;
+    };
+  };
+}
+
+// Video 组件的兼容性 props
+export interface VideoProps {
+  source: { uri: string };
+  style?: any;
+  resizeMode?: ResizeMode;
+  shouldPlay?: boolean;
+  isLooping?: boolean;
+  isMuted?: boolean;
+  useNativeControls?: boolean;
+  onReadyForDisplay?: (event: VideoReadyForDisplayEvent) => void;
+  onError?: (error: any) => void;
+  onPlaybackStatusUpdate?: (status: AVPlaybackStatus) => void;
+  ref?: React.RefObject<Video>;
+}