feat: 完成前端响应式设计优化，增强移动端体验

- 添加触摸手势支持库 (react-spring + @use-gesture/react)
- 照片模态框增加左右滑动切换功能
- 照片画廊增加下拉刷新功能 (移动端)
- 优化所有按钮符合44px最小触摸目标标准
- 增强移动端导航体验，增加悬停和选中状态
- 创建设备信息检测钩子 (useDeviceInfo)
- 开发优化图片组件，支持懒加载和骨架屏
- 改进移动端手势交互和视觉反馈
- 完善响应式断点系统和触摸设备检测
- 前端构建测试成功，开发服务器正常启动

Task 23 completed: 前端响应式设计优化

frontend/components/optimized-image.tsx

@@ -0,0 +1,140 @@
+"use client"
+
+import { useState, useRef, useEffect } from "react"
+import Image from "next/image"
+import { useDeviceInfo } from "@/hooks/use-mobile"
+
+interface OptimizedImageProps {
+  src: string
+  alt: string
+  width?: number
+  height?: number
+  className?: string
+  priority?: boolean
+  onClick?: () => void
+  onLoad?: () => void
+}
+
+export function OptimizedImage({
+  src,
+  alt,
+  width,
+  height,
+  className = "",
+  priority = false,
+  onClick,
+  onLoad
+}: OptimizedImageProps) {
+  const [isLoaded, setIsLoaded] = useState(false)
+  const [isInView, setIsInView] = useState(false)
+  const [hasError, setHasError] = useState(false)
+  const imgRef = useRef<HTMLDivElement>(null)
+  const { isMobile, viewport } = useDeviceInfo()
+
+  // 交叉观察器用于懒加载
+  useEffect(() => {
+    if (priority) {
+      setIsInView(true)
+      return
+    }
+
+    const observer = new IntersectionObserver(
+      ([entry]) => {
+        if (entry.isIntersecting) {
+          setIsInView(true)
+          observer.disconnect()
+        }
+      },
+      {
+        rootMargin: isMobile ? "50px" : "100px", // 移动端更小的预加载距离
+        threshold: 0.1
+      }
+    )
+
+    if (imgRef.current) {
+      observer.observe(imgRef.current)
+    }
+
+    return () => observer.disconnect()
+  }, [priority, isMobile])
+
+  const handleLoad = () => {
+    setIsLoaded(true)
+    onLoad?.()
+  }
+
+  const handleError = () => {
+    setHasError(true)
+  }
+
+  // 根据设备选择合适的图片质量
+  const getOptimizedSrc = (originalSrc: string) => {
+    if (hasError) return "/placeholder.svg"
+    
+    // 如果是移动端，可以考虑使用更低质量的图片
+    if (isMobile && viewport.width < 768) {
+      // 这里可以添加图片质量优化逻辑
+      // 例如：添加 ?quality=80&w=400 等参数
+      return originalSrc
+    }
+    
+    return originalSrc
+  }
+
+  return (
+    <div 
+      ref={imgRef}
+      className={`relative overflow-hidden ${className}`}
+      onClick={onClick}
+    >
+      {/* 骨架屏加载状态 */}
+      {!isLoaded && isInView && (
+        <div className="absolute inset-0 bg-gray-200 animate-pulse">
+          <div className="flex items-center justify-center h-full">
+            <div className="w-8 h-8 border-2 border-gray-300 border-t-gray-600 rounded-full animate-spin"></div>
+          </div>
+        </div>
+      )}
+
+      {/* 错误状态 */}
+      {hasError && (
+        <div className="absolute inset-0 bg-gray-100 flex items-center justify-center">
+          <div className="text-center text-gray-500">
+            <svg className="w-12 h-12 mx-auto mb-2" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M4 16l4.586-4.586a2 2 0 012.828 0L16 16m-2-2l1.586-1.586a2 2 0 012.828 0L20 14m-6-6h.01M6 20h12a2 2 0 002-2V6a2 2 0 00-2-2H6a2 2 0 00-2 2v12a2 2 0 002 2z" />
+            </svg>
+            <p className="text-xs">图片加载失败</p>
+          </div>
+        </div>
+      )}
+
+      {/* 实际图片 */}
+      {isInView && !hasError && (
+        <Image
+          src={getOptimizedSrc(src)}
+          alt={alt}
+          width={width}
+          height={height}
+          fill={!width || !height}
+          className={`object-cover transition-opacity duration-500 ${
+            isLoaded ? "opacity-100" : "opacity-0"
+          }`}
+          onLoad={handleLoad}
+          onError={handleError}
+          priority={priority}
+          draggable={false}
+          sizes={
+            isMobile 
+              ? "(max-width: 768px) 100vw, 50vw"
+              : "(max-width: 1024px) 50vw, 33vw"
+          }
+        />
+      )}
+
+      {/* 渐进式加载效果 */}
+      {isLoaded && (
+        <div className={`absolute inset-0 bg-gradient-to-t from-black/20 via-transparent to-transparent opacity-0 transition-opacity duration-300 ${onClick ? "group-hover:opacity-100" : ""}`} />
+      )}
+    </div>
+  )
+}