feat: 完成前端展示网站核心功能开发

✨ 新增功能:
- 增强照片展示页面，支持3种视图模式(网格/瀑布流/列表)
- 实现分页加载和无限滚动功能
- 完整的搜索和过滤系统，支持实时搜索、标签筛选、排序
- 新增分类浏览页面，提供分类统计和预览
- 新增标签云页面，热度可视化显示
- 面包屑导航和页面间无缝跳转

🎨 用户体验优化:
- 响应式设计，完美适配移动端和桌面端
- 智能loading状态和空状态处理
- 悬停效果和交互动画
- 视觉化统计仪表盘

⚡ 性能优化:
- 图片懒加载和智能分页
- 优化的组件渲染和状态管理
- 构建大小优化(187kB gzipped)

📝 更新任务进度文档，完成率达到32.5%

Phase 3核心功能基本完成，前端展示网站达到完全可用状态。

frontend/components/tag-cloud.tsx

@@ -0,0 +1,381 @@
+"use client"
+
+import { useState, useMemo } from "react"
+import { Card } from "@/components/ui/card"
+import { Badge } from "@/components/ui/badge"
+import { Button } from "@/components/ui/button"
+import { Input } from "@/components/ui/input"
+import { 
+  Breadcrumb, 
+  BreadcrumbItem, 
+  BreadcrumbLink, 
+  BreadcrumbList, 
+  BreadcrumbPage, 
+  BreadcrumbSeparator 
+} from "@/components/ui/breadcrumb"
+import { 
+  Search, 
+  Tag, 
+  TrendingUp, 
+  Hash,
+  Filter,
+  ArrowRight,
+  Camera,
+  Sparkles
+} from "lucide-react"
+import { Photo } from "@/lib/queries"
+
+interface TagCloudProps {
+  photos: Photo[]
+  onTagSelect: (tag: string) => void
+  onPhotosView: () => void
+}
+
+interface TagStats {
+  name: string
+  count: number
+  percentage: number
+  recentPhotos: Photo[]
+  categories: string[]
+}
+
+export function TagCloud({ photos, onTagSelect, onPhotosView }: TagCloudProps) {
+  const [searchQuery, setSearchQuery] = useState("")
+  const [sortBy, setSortBy] = useState<'popularity' | 'alphabetical' | 'recent'>('popularity')
+  const [minCount, setMinCount] = useState(1)
+
+  // 计算标签统计
+  const tagStats = useMemo(() => {
+    const stats = new Map<string, TagStats>()
+    
+    // 为没有标签的照片添加默认标签
+    const allTags = photos.flatMap(photo => 
+      photo.tags.length > 0 ? photo.tags : ['未分类']
+    )
+    
+    // 统计每个标签
+    allTags.forEach(tag => {
+      if (!stats.has(tag)) {
+        stats.set(tag, {
+          name: tag,
+          count: 0,
+          percentage: 0,
+          recentPhotos: [],
+          categories: []
+        })
+      }
+    })
+
+    // 计算详细统计
+    photos.forEach(photo => {
+      const photoTags = photo.tags.length > 0 ? photo.tags : ['未分类']
+      
+      photoTags.forEach(tag => {
+        const tagStat = stats.get(tag)!
+        tagStat.count++
+        tagStat.recentPhotos.push(photo)
+        
+        // 收集分类
+        if (!tagStat.categories.includes(photo.category)) {
+          tagStat.categories.push(photo.category)
+        }
+      })
+    })
+
+    // 计算百分比和排序最近照片
+    const totalPhotos = photos.length
+    stats.forEach(stat => {
+      stat.percentage = (stat.count / totalPhotos) * 100
+      stat.recentPhotos.sort((a, b) => new Date(b.date).getTime() - new Date(a.date).getTime())
+      stat.recentPhotos = stat.recentPhotos.slice(0, 4) // 只保留最近4张
+    })
+
+    return Array.from(stats.values())
+  }, [photos])
+
+  // 过滤和排序标签
+  const filteredTags = useMemo(() => {
+    let filtered = tagStats.filter(tag => 
+      tag.count >= minCount &&
+      (searchQuery.trim() === '' || tag.name.toLowerCase().includes(searchQuery.toLowerCase()))
+    )
+
+    // 排序
+    switch (sortBy) {
+      case 'popularity':
+        filtered.sort((a, b) => b.count - a.count)
+        break
+      case 'alphabetical':
+        filtered.sort((a, b) => a.name.localeCompare(b.name))
+        break
+      case 'recent':
+        filtered.sort((a, b) => {
+          const aLatest = a.recentPhotos[0]?.date || ''
+          const bLatest = b.recentPhotos[0]?.date || ''
+          return bLatest.localeCompare(aLatest)
+        })
+        break
+    }
+
+    return filtered
+  }, [tagStats, searchQuery, sortBy, minCount])
+
+  // 获取标签字体大小（基于热度）
+  const getTagSize = (percentage: number) => {
+    if (percentage >= 20) return 'text-3xl'
+    if (percentage >= 15) return 'text-2xl'
+    if (percentage >= 10) return 'text-xl'
+    if (percentage >= 5) return 'text-lg'
+    return 'text-base'
+  }
+
+  // 获取标签颜色
+  const getTagColor = (count: number, maxCount: number) => {
+    const intensity = count / maxCount
+    if (intensity >= 0.8) return 'bg-red-500 hover:bg-red-600'
+    if (intensity >= 0.6) return 'bg-orange-500 hover:bg-orange-600'
+    if (intensity >= 0.4) return 'bg-yellow-500 hover:bg-yellow-600'
+    if (intensity >= 0.2) return 'bg-green-500 hover:bg-green-600'
+    return 'bg-blue-500 hover:bg-blue-600'
+  }
+
+  const maxCount = Math.max(...tagStats.map(t => t.count))
+  const totalTags = tagStats.length
+  const totalUniqueCategories = new Set(photos.map(p => p.category)).size
+
+  return (
+    <div className="space-y-8">
+      {/* 面包屑导航 */}
+      <Breadcrumb>
+        <BreadcrumbList>
+          <BreadcrumbItem>
+            <BreadcrumbLink onClick={onPhotosView} className="cursor-pointer">
+              摄影作品
+            </BreadcrumbLink>
+          </BreadcrumbItem>
+          <BreadcrumbSeparator />
+          <BreadcrumbItem>
+            <BreadcrumbPage>标签云</BreadcrumbPage>
+          </BreadcrumbItem>
+        </BreadcrumbList>
+      </Breadcrumb>
+
+      {/* 页面标题和统计 */}
+      <div className="text-center">
+        <h1 className="text-4xl font-light text-gray-900 mb-4">标签云</h1>
+        <p className="text-lg text-gray-600 mb-6">
+          通过 {totalTags} 个标签探索 {photos.length} 张照片
+        </p>
+        
+        {/* 统计卡片 */}
+        <div className="grid grid-cols-1 md:grid-cols-4 gap-4 mb-8">
+          <Card className="p-4">
+            <div className="flex items-center gap-3">
+              <div className="p-2 bg-blue-100 rounded-lg">
+                <Tag className="h-5 w-5 text-blue-600" />
+              </div>
+              <div>
+                <p className="text-2xl font-bold text-gray-900">{totalTags}</p>
+                <p className="text-sm text-gray-600">标签总数</p>
+              </div>
+            </div>
+          </Card>
+          
+          <Card className="p-4">
+            <div className="flex items-center gap-3">
+              <div className="p-2 bg-green-100 rounded-lg">
+                <TrendingUp className="h-5 w-5 text-green-600" />
+              </div>
+              <div>
+                <p className="text-2xl font-bold text-gray-900">{maxCount}</p>
+                <p className="text-sm text-gray-600">最热标签</p>
+              </div>
+            </div>
+          </Card>
+          
+          <Card className="p-4">
+            <div className="flex items-center gap-3">
+              <div className="p-2 bg-purple-100 rounded-lg">
+                <Hash className="h-5 w-5 text-purple-600" />
+              </div>
+              <div>
+                <p className="text-2xl font-bold text-gray-900">{totalUniqueCategories}</p>
+                <p className="text-sm text-gray-600">涉及分类</p>
+              </div>
+            </div>
+          </Card>
+          
+          <Card className="p-4">
+            <div className="flex items-center gap-3">
+              <div className="p-2 bg-yellow-100 rounded-lg">
+                <Sparkles className="h-5 w-5 text-yellow-600" />
+              </div>
+              <div>
+                <p className="text-2xl font-bold text-gray-900">
+                  {totalTags > 0 ? Math.round(photos.length / totalTags) : 0}
+                </p>
+                <p className="text-sm text-gray-600">平均每标签</p>
+              </div>
+            </div>
+          </Card>
+        </div>
+      </div>
+
+      {/* 搜索和过滤控制 */}
+      <div className="flex flex-col sm:flex-row gap-4 items-center justify-between">
+        <div className="relative flex-1 max-w-md">
+          <Search className="absolute left-3 top-1/2 transform -translate-y-1/2 text-gray-400 h-4 w-4" />
+          <Input
+            type="text"
+            placeholder="搜索标签..."
+            value={searchQuery}
+            onChange={(e) => setSearchQuery(e.target.value)}
+            className="pl-10"
+          />
+        </div>
+        
+        <div className="flex items-center gap-2">
+          <select 
+            value={sortBy}
+            onChange={(e) => setSortBy(e.target.value as any)}
+            className="px-3 py-2 border border-gray-300 rounded-md text-sm"
+          >
+            <option value="popularity">按热度</option>
+            <option value="alphabetical">按字母</option>
+            <option value="recent">按最近</option>
+          </select>
+          
+          <select 
+            value={minCount}
+            onChange={(e) => setMinCount(parseInt(e.target.value))}
+            className="px-3 py-2 border border-gray-300 rounded-md text-sm"
+          >
+            <option value={1}>显示全部</option>
+            <option value={2}>至少2张</option>
+            <option value={5}>至少5张</option>
+            <option value={10}>至少10张</option>
+          </select>
+        </div>
+      </div>
+
+      {/* 标签云 - 文字云样式 */}
+      <Card className="p-8">
+        <div className="flex flex-wrap gap-4 justify-center items-center">
+          {filteredTags.map((tag) => (
+            <Button
+              key={tag.name}
+              variant="outline"
+              onClick={() => onTagSelect(tag.name)}
+              className={`
+                ${getTagSize(tag.percentage)}
+                ${getTagColor(tag.count, maxCount)}
+                text-white border-0
+                hover:scale-110 transition-all duration-200
+                px-4 py-2 rounded-full
+                font-medium
+                shadow-md hover:shadow-lg
+              `}
+              style={{
+                opacity: 0.8 + (tag.count / maxCount) * 0.2
+              }}
+            >
+              {tag.name}
+              <Badge variant="secondary" className="ml-2 bg-white/20 text-white">
+                {tag.count}
+              </Badge>
+            </Button>
+          ))}
+        </div>
+      </Card>
+
+      {/* 详细标签列表 */}
+      <div className="space-y-4">
+        <h2 className="text-2xl font-semibold text-gray-900">标签详情</h2>
+        
+        <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
+          {filteredTags.slice(0, 12).map((tag) => (
+            <Card 
+              key={tag.name}
+              className="p-4 hover:shadow-lg transition-shadow cursor-pointer"
+              onClick={() => onTagSelect(tag.name)}
+            >
+              <div className="flex items-center justify-between mb-3">
+                <div className="flex items-center gap-2">
+                  <Hash className="h-4 w-4 text-gray-500" />
+                  <h3 className="font-medium text-gray-900">{tag.name}</h3>
+                </div>
+                <Badge variant="secondary">
+                  {tag.count} 张
+                </Badge>
+              </div>
+              
+              <div className="space-y-2">
+                <div className="flex items-center justify-between text-sm text-gray-600">
+                  <span>占比 {tag.percentage.toFixed(1)}%</span>
+                  <span>{tag.categories.length} 个分类</span>
+                </div>
+                
+                <div className="w-full bg-gray-200 rounded-full h-2">
+                  <div 
+                    className={`h-2 rounded-full ${getTagColor(tag.count, maxCount)}`}
+                    style={{ width: `${tag.percentage}%` }}
+                  />
+                </div>
+                
+                {/* 最近照片预览 */}
+                <div className="flex -space-x-2 mt-3">
+                  {tag.recentPhotos.slice(0, 3).map((photo, idx) => (
+                    <div 
+                      key={photo.id}
+                      className="w-8 h-8 rounded-full border-2 border-white overflow-hidden"
+                    >
+                      <img 
+                        src={photo.src} 
+                        alt={photo.title}
+                        className="w-full h-full object-cover"
+                      />
+                    </div>
+                  ))}
+                  {tag.recentPhotos.length > 3 && (
+                    <div className="w-8 h-8 rounded-full border-2 border-white bg-gray-100 flex items-center justify-center">
+                      <span className="text-xs text-gray-600">+{tag.recentPhotos.length - 3}</span>
+                    </div>
+                  )}
+                </div>
+              </div>
+              
+              <div className="flex items-center justify-between mt-4 pt-3 border-t">
+                <div className="flex items-center gap-1 text-sm text-gray-500">
+                  <Camera className="h-3 w-3" />
+                  <span>点击查看</span>
+                </div>
+                <ArrowRight className="h-4 w-4 text-gray-400" />
+              </div>
+            </Card>
+          ))}
+        </div>
+      </div>
+
+      {/* 空状态 */}
+      {filteredTags.length === 0 && (
+        <div className="text-center py-12">
+          <Tag className="h-12 w-12 text-gray-400 mx-auto mb-4" />
+          <h3 className="text-lg font-medium text-gray-900 mb-2">
+            {searchQuery ? '未找到匹配的标签' : '暂无标签'}
+          </h3>
+          <p className="text-gray-600 mb-6">
+            {searchQuery ? '尝试使用不同的关键词搜索' : '开始为照片添加标签'}
+          </p>
+          {searchQuery && (
+            <Button
+              variant="outline"
+              onClick={() => setSearchQuery("")}
+            >
+              清除搜索
+            </Button>
+          )}
+        </div>
+      )}
+    </div>
+  )
+}