🐛 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>

components/media/fullscreen-media-modal.tsx

@@ -3,8 +3,14 @@ import { VideoPlayer } from '@/components/video/video-player';
 import { useThemeColor } from '@/hooks/use-theme-color';
 import { Template } from '@/lib/types/template';
 import { Image } from 'expo-image';
-import { ResizeMode } from 'expo-av';
 import React, { useEffect, useRef, useState, useCallback } from 'react';
+
+// ResizeMode 兼容映射
+const ResizeMode = {
+  CONTAIN: 'contain' as const,
+  COVER: 'cover' as const,
+  STRETCH: 'fill' as const,
+};
 import {
   ActivityIndicator,
   Dimensions,
@@ -126,7 +132,7 @@ export function FullscreenMediaModal({
   useEffect(() => {
     const handleBackPress = () => {
       if (visible) {
-        handleClose();
+        onClose();
         return true;
       }
       return false;
@@ -134,7 +140,7 @@ export function FullscreenMediaModal({
 
     const subscription = BackHandler.addEventListener('hardwareBackPress', handleBackPress);
     return () => subscription.remove();
-  }, [visible, handleClose]);
+  }, [visible, onClose]);
 
   if (!visible || !currentTemplate) return null;