fix: 统一处理流程和后台任务显示

- 处理流程抓取失败时记录到失败URL库
- /search页面新增产品处理会话展示区
- 同时显示后台抓取任务和产品处理会话
- 自动刷新同时更新三种数据：任务、会话、失败URL

templates/search.html

@@ -111,6 +111,26 @@
             </div>
         </div>
 
+        <!-- 产品处理会话区域 -->
+        <div class="panel process-sessions-section">
+            <div class="panel-header">
+                <h2><i class="ri-play-circle-line"></i> 产品处理会话</h2>
+                <div class="panel-actions">
+                    <a href="/process" class="btn btn-primary btn-sm">
+                        <i class="ri-external-link-line"></i> 监控页面
+                    </a>
+                    <button onclick="loadProcessSessions()" class="btn btn-secondary btn-sm">
+                        <i class="ri-refresh-line"></i> 刷新
+                    </button>
+                </div>
+            </div>
+            <div class="panel-body">
+                <div id="process-sessions-list" class="background-tasks-list">
+                    <div class="empty-text">暂无处理会话</div>
+                </div>
+            </div>
+        </div>
+
         <!-- 失败URL区域 -->
         <div class="panel failed-urls-section">
             <div class="panel-header">