修复搜索和重复检查问题

1. 搜索文章时增加URL字段搜索，解决重复抓取问题
2. 优化搜索结果解析，多获取几个结果确保返回足够数量

models/database.py

@@ -157,16 +157,16 @@ class Database:
             if category:
                 cursor.execute('''
                     SELECT * FROM articles 
-                    WHERE (product_names LIKE ? OR keywords LIKE ? OR summary LIKE ? OR content LIKE ?)
+                    WHERE (product_names LIKE ? OR keywords LIKE ? OR summary LIKE ? OR content LIKE ? OR url LIKE ?)
                     AND category = ?
                     ORDER BY fetch_date DESC
-                ''', (f'%{keyword}%', f'%{keyword}%', f'%{keyword}%', f'%{keyword}%', category))
+                ''', (f'%{keyword}%', f'%{keyword}%', f'%{keyword}%', f'%{keyword}%', f'%{keyword}%', category))
             else:
                 cursor.execute('''
                     SELECT * FROM articles 
-                    WHERE product_names LIKE ? OR keywords LIKE ? OR summary LIKE ? OR content LIKE ?
+                    WHERE product_names LIKE ? OR keywords LIKE ? OR summary LIKE ? OR content LIKE ? OR url LIKE ?
                     ORDER BY fetch_date DESC
-                ''', (f'%{keyword}%', f'%{keyword}%', f'%{keyword}%', f'%{keyword}%'))
+                ''', (f'%{keyword}%', f'%{keyword}%', f'%{keyword}%', f'%{keyword}%', f'%{keyword}%'))
             return [dict(row) for row in cursor.fetchall()]
     
     def get_article_by_id(self, article_id):

services/search_service.py

@@ -157,12 +157,17 @@ class SearchService:
                 if match:
                     title = match.group(1)
                     ref = match.group(2)
-                    # 放宽过滤条件：只要不是纯域名格式就保留
+                    # 过滤纯域名格式
-                    if not (title.endswith('.com') or title.endswith('.cn') or title.endswith('.net')):
+                    is_domain = (title.endswith('.com') or title.endswith('.cn') or 
+                                 title.endswith('.net') or title.endswith('.org') or
+                                 title.endswith('.edu') or title.endswith('.gov'))
+                    if not is_domain:
                         refs.append((title, ref))
         
-        # 获取每个结果的 URL
+        # 获取每个结果的 URL，多获取几个以防解析失败
-        for title, ref in refs[:max_results]:
+        for title, ref in refs[:max_results + 5]:
+            if len(results) >= max_results:
+                break
             url = self._get_link_url(ref)
             if url and 'bing.com/search' not in url:  # 过滤搜索结果页本身的链接
                 results.append({