fix chat session traces and document paths

src/main/java/com/superbiz/agent/tool/LookupKnowledgeTool.java

@@ -3,8 +3,8 @@ package com.superbiz.agent.tool;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.superbiz.agent.domain.entity.ToolInvocation;
 import com.superbiz.agent.dto.*;
-import com.superbiz.agent.repository.ToolInvocationRepository;
 import com.superbiz.agent.service.KnowledgeIndexService;
+import com.superbiz.agent.service.ToolInvocationRecorder;
 import com.superbiz.agent.service.VectorSearchService;
 import com.superbiz.agent.util.SessionContextHolder;
 import lombok.extern.slf4j.Slf4j;
@@ -49,7 +49,7 @@ public class LookupKnowledgeTool {
     private VectorSearchService vectorSearchService;
 
     @Autowired
-    private ToolInvocationRepository toolInvocationRepository;
+    private ToolInvocationRecorder toolInvocationRecorder;
 
     @Autowired
     private RetrievedDocTracker retrievedDocTracker;
@@ -417,7 +417,7 @@ public class LookupKnowledgeTool {
                     .success(true)
                     .build();
 
-            toolInvocationRepository.save(inv);
+            toolInvocationRecorder.save(inv);
             log.debug("tool_invocation 已保存: sessionId={}, layer={}, relevanceLevel={}, duration={}ms",
                 sessionId, layer, result != null ? result.getRelevanceLevel() : null, duration);
         } catch (Exception e) {