优化主页内容库和搜索区域显示

- 内容库区域显示文章数、分类数、今日新增统计
- 搜索区域显示失败抓取数和支持的搜索引擎
- 点击'进入'按钮跳转到单独页面
- 移除大块入口链接，界面更简洁

static/js/app.js

@@ -24,8 +24,8 @@ async function refreshData() {
         await Promise.all([
             loadStats(),
             loadPendingProducts(),
-            loadArticles(),
-            loadHistory()
+            loadHistory(),
+            loadQuickStats()
         ]);
         updateSystemStatus(true);
     } catch (error) {
@@ -66,6 +66,38 @@ async function loadStats() {
     }
 }
 
+// 加载快速统计信息
+async function loadQuickStats() {
+    try {
+        // 加载文章统计
+        const articlesResponse = await fetch(`${API_BASE}/api/articles?limit=1000`);
+        const articlesData = await articlesResponse.json();
+        
+        if (articlesData.success) {
+            document.getElementById('quick-articles-count').textContent = articlesData.count;
+            
+            // 计算分类数
+            const categories = new Set(articlesData.articles.map(a => a.category).filter(c => c));
+            document.getElementById('quick-categories-count').textContent = categories.size;
+            
+            // 计算今日新增
+            const today = new Date().toISOString().split('T')[0];
+            const todayCount = articlesData.articles.filter(a => a.fetch_date && a.fetch_date.startsWith(today)).length;
+            document.getElementById('quick-today-count').textContent = todayCount;
+        }
+        
+        // 加载失败URL数
+        const failedResponse = await fetch(`${API_BASE}/api/articles/failed-urls`);
+        const failedData = await failedResponse.json();
+        
+        if (failedData.success) {
+            document.getElementById('quick-failed-count').textContent = failedData.count;
+        }
+    } catch (error) {
+        console.error('加载快速统计失败:', error);
+    }
+}
+
 // 加载待处理产品
 async function loadPendingProducts() {
     try {