Fix: 添加详细调试日志诊断拓扑连线问题

- 在拓扑构建时输出每个设备的邻居详情
- 显示邻居的RemoteIP、RemoteDevice、接口信息
- 从数据库加载设备后重建拓扑确保连线正确
- 帮助诊断为什么邻居无法自动连线

cmd/main.go

@@ -265,6 +265,13 @@ func (app *App) handleGetDevices(w http.ResponseWriter, r *http.Request) {
 			log.Printf("Error: failed to get devices from database: %v", err)
 			// 降级到 builder获取
 			devices = app.builder.GetDevices()
+		} else {
+			// 重新构建设备到builder中，确保拓扑正确
+			app.builder = topology.NewBuilder()
+			for _, dev := range devices {
+				app.builder.AddDevice(dev)
+			}
+			log.Printf("Rebuilt topology with %d devices from database", len(devices))
 		}
 		log.Printf("Returning %d devices from storage", len(devices))
 	} else {

internal/topology/builder.go

@@ -50,6 +50,15 @@ func (b *Builder) Build() models.TopologyGraph {
 		}
 		nodeMap[device.IP] = node
 		graph.Nodes = append(graph.Nodes, node)
+		
+		// 调试信息
+		fmt.Printf("Node added: %s (%s) with %d neighbors\n", 
+			device.IP, device.Type, len(device.Neighbors))
+		for i, neighbor := range device.Neighbors {
+			fmt.Printf("  Neighbor %d: RemoteIP=%s, RemoteDevice=%s, LocalIf=%s, RemoteIf=%s\n",
+				i+1, neighbor.RemoteIP, neighbor.RemoteDevice, 
+				neighbor.LocalInterface, neighbor.RemoteInterface)
+		}
 	}
 
 	// 构建边(基于邻居信息)