✨ feat: 性能优化与余额扣费系统集成

主要更新：
- 🚀 模板详情页性能优化：添加缓存机制、图片预加载、请求中断控制
- 💰 集成余额检查与扣费功能到表单提交流程
- 🔄 添加错误重试机制，提升用户体验
- 🎨 重构动态表单字段为独立组件 (DynamicFormField)
- 🔧 修复类型错误，优化样式结构

技术细节：
- 实现5分钟缓存策略减少API调用
- 使用 AbortController 管理请求生命周期
- React.memo 优化列表项渲染性能
- 图片预缓存提升加载体验

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

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

components/video/fullscreen-video-modal.tsx

@@ -1,6 +1,6 @@
 import { ThemedText } from '@/components/themed-text';
 import { VideoView, useVideoPlayer } from 'expo-video';
-import React, { useCallback, useEffect, useState } from 'react';
+import React, { useCallback, useEffect, useMemo, useRef, useState } from 'react';
 import {
   ActivityIndicator,
   Dimensions,
@@ -43,10 +43,15 @@ export function FullscreenVideoModal({
   hasNext = false,
   hasPrevious = false,
 }: FullscreenVideoModalProps) {
-  const player = useVideoPlayer(
-    {
-      uri: videoUrl,
-    },
+  // 使用useRef存储player实例，避免无限循环
+  const playerRef = useRef<any>(null);
+
+  // 稳定videoUrl，使用useMemo
+  const stableVideoUrl = useMemo(() => ({ uri: videoUrl }), [videoUrl]);
+
+  // 始终调用useVideoPlayer，但只在videoUrl变化时更新player
+  const newPlayer = useVideoPlayer(
+    stableVideoUrl,
     (player) => {
       player.loop = isLooping;
       player.muted = isMuted;
@@ -56,6 +61,14 @@ export function FullscreenVideoModal({
     }
   );
 
+  // 只有当newPlayer变化时才更新player
+  useEffect(() => {
+    playerRef.current = newPlayer;
+  }, [newPlayer]);
+
+  // 获取当前的player实例
+  const player = playerRef.current || newPlayer;
+
   const [isLoading, setIsLoading] = useState(true);
 
   // 重置状态当模态框打开/关闭时
@@ -63,8 +76,9 @@ export function FullscreenVideoModal({
     if (visible) {
       setIsLoading(true);
     } else {
-      if (player) {
-        player.pause();
+      const currentPlayer = playerRef.current;
+      if (currentPlayer) {
+        currentPlayer.pause();
       }
     }
   }, [visible, autoPlay]);
@@ -73,7 +87,8 @@ export function FullscreenVideoModal({
   const handleVideoReady = () => {
     setIsLoading(false);
     if (autoPlay) {
-      player?.play();
+      const currentPlayer = playerRef.current;
+      currentPlayer?.play();
     }
   };
 
@@ -160,9 +175,8 @@ export function FullscreenVideoModal({
               <VideoView
                 player={player}
                 style={styles.video}
-                contentFit="contain" as any
+                contentFit="contain"
                 nativeControls={false}
-                onError={handleVideoError}
               />
             )}