feat: implement buildResumeTargets function and update resume handling logic

internal/ai/runtime/tools/analyze_conversation_tool.go

@@ -100,7 +100,7 @@ func (t *AnalyzeConversationTool) Info(ctx context.Context) (*schema.ToolInfo, e
 		}),
 		Extra: map[string]any{
 			"toolCode":   toolx.GraphAnalyzeConversation.Code,
-			"sourceType": "graph",
+			"sourceType": toolx.GraphAnalyzeConversation.SourceType,
 		},
 	}, nil
 }

internal/ai/runtime/tools/handoff_graph_tool.go

@@ -69,7 +69,7 @@ func (t *HandoffGraphTool) Info(ctx context.Context) (*schema.ToolInfo, error) {
 		}),
 		Extra: map[string]any{
 			"toolCode":   toolx.GraphHandoffConversation.Code,
-			"sourceType": "graph",
+			"sourceType": toolx.GraphHandoffConversation.SourceType,
 		},
 	}, nil
 }