添加知识库图谱可视化 API 路由，并在 WebUI 服务器中注册相关路由

test_edge.py

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+from src.chat.knowledge.kg_manager import KGManager
+
+kg = KGManager()
+kg.load_from_file()
+
+edges = kg.graph.get_edge_list()
+if edges:
+    e = edges[0]
+    print(f"Edge tuple: {e}")
+    print(f"Edge tuple type: {type(e)}")
+    
+    edge_data = kg.graph[e[0], e[1]]
+    print(f"\nEdge data type: {type(edge_data)}")
+    print(f"Edge data: {edge_data}")
+    print(f"Has 'get' method: {hasattr(edge_data, 'get')}")
+    print(f"Is dict: {isinstance(edge_data, dict)}")
+    
+    # 尝试不同的访问方式
+    try:
+        print(f"\nUsing []: {edge_data['weight']}")
+    except Exception as e:
+        print(f"Using [] failed: {e}")
+    
+    try:
+        print(f"Using .get(): {edge_data.get('weight')}")
+    except Exception as e:
+        print(f"Using .get() failed: {e}")
+    
+    # 查看所有属性
+    print(f"\nDir: {[x for x in dir(edge_data) if not x.startswith('_')]}")