三期-修复获取会话列表接口报错

src/main/java/com/wok/supportbot/service/ConversationService.java

@@ -38,7 +38,7 @@ public class ConversationService {
      */
     public Map<String, Object> listConversations(int page, int size, String keyword) {
         // 构建基础 SQL 条件
-        StringBuilder whereClause = new StringBuilder("WHERE is_delete = false");
+        StringBuilder whereClause = new StringBuilder("WHERE is_delete = false ");
         List<Object> params = new ArrayList<>();
 
         if (keyword != null && !keyword.isEmpty()) {