新增搜索标题和网页标题双字段

- 数据库新增 search_title 字段存储搜索结果标题
- product_names 存储抓取到的网页标题
- 搜索页面显示两个标题（搜索标题 + 网页标题）
- 内容库页面也显示两个标题

static/js/library.js

@@ -118,6 +118,11 @@ function displayArticles() {
                         </button>
                     </div>
                 </div>
+                ${article.search_title && article.search_title !== productNames.join(', ') ? `
+                    <div class="article-search-title">
+                        <i class="ri-search-line"></i> 搜索标题: ${escapeHtml(article.search_title)}
+                    </div>
+                ` : ''}
                 <div class="article-meta">
                     ${article.category ? `<span class="article-category">${escapeHtml(article.category)}</span>` : ''}
                     <span><i class="ri-link"></i> ${escapeHtml(article.source || '未知来源')}</span>

static/js/search.js

@@ -135,6 +135,11 @@ function displayResults() {
                     ${r.saved ? '<i class="ri-check-line saved-icon"></i>' : ''}
                     ${escapeHtml(r.title)}
                 </div>
+                ${r.pageTitle && r.pageTitle !== r.title ? `
+                    <div class="result-page-title">
+                        <i class="ri-article-line"></i> 网页标题: ${escapeHtml(r.pageTitle)}
+                    </div>
+                ` : ''}
                 <div class="result-url">
                     <a href="${escapeHtml(r.url)}" target="_blank">
                         <i class="ri-external-link-line"></i>
@@ -207,7 +212,8 @@ async function fetchResult(index) {
             headers: { 'Content-Type': 'application/json' },
             body: JSON.stringify({
                 url: result.url,
-                product_names: [result.title]
+                product_names: [result.title],
+                search_title: result.title  // 搜索结果的标题
             })
         });
 
@@ -216,7 +222,7 @@ async function fetchResult(index) {
         if (data.success) {
             searchResults[index].fetched = true;
             searchResults[index].content = data.data.content;
-            searchResults[index].title = data.data.title || result.title;
+            searchResults[index].pageTitle = data.data.title || result.title;  // 抓取到的标题
             
             btn.innerHTML = '<i class="ri-check-line"></i> 已抓取';