fix：知识库检索

src/main/java/cn/com/poc/agent_application/aggregate/impl/AgentApplicationInfoServiceImpl.java

@@ -527,11 +527,11 @@ public class AgentApplicationInfoServiceImpl implements AgentApplicationInfoServ
                 knowledgeIds.add(knowledgeDocumentEntity.getKnowledgeId());
             }
 
-            Object content = messages.get(messages.size() - 1);
+            Object content = messages.get(messages.size() - 1).getContent();
             String query = "";
 
             if (content instanceof List) {
-                query = ((List<MultiContent>) content).get(0).getText();
+                query = ((List<HashMap>) content).get(0).get("text").toString();
             } else {
                 query = content.toString();
             }