Debug: 添加详细日志以诊断设备列表和数据显示问题

- 添加设备时记录接口和邻居数量
- 获取设备列表时记录返回数量
- 数据库保存成功/失败都有明确日志
- 创建API测试脚本便于调试

cmd/main.go

@@ -262,12 +262,14 @@ func (app *App) handleGetDevices(w http.ResponseWriter, r *http.Request) {
 		var err error
 		devices, err = app.storage.GetAllDevices()
 		if err != nil {
-			log.Printf("Warning: failed to get devices from database: %v", err)
-			// 降级到从builder获取
+			log.Printf("Error: failed to get devices from database: %v", err)
+			// 降级到 builder获取
 			devices = app.builder.GetDevices()
 		}
+		log.Printf("Returning %d devices from storage", len(devices))
 	} else {
 		devices = app.builder.GetDevices()
+		log.Printf("Returning %d devices from builder", len(devices))
 	}
 
 	w.Header().Set("Content-Type", "application/json")
@@ -294,20 +296,28 @@ func (app *App) handleAddDevice(w http.ResponseWriter, r *http.Request) {
 	}
 
 	deviceType := models.DeviceType(req.Type)
+	log.Printf("Adding device: %s (type: %s)", req.IP, req.Type)
+	
 	dev, err := device.DiscoverDevice(req.IP, deviceType, req.Username, req.Password)
 	if err != nil {
+		log.Printf("Failed to discover device %s: %v", req.IP, err)
 		w.Header().Set("Content-Type", "application/json")
 		w.WriteHeader(http.StatusInternalServerError)
 		json.NewEncoder(w).Encode(map[string]string{"message": err.Error()})
 		return
 	}
 
+	log.Printf("Device discovered: %s, interfaces: %d, neighbors: %d", 
+		dev.IP, len(dev.Interfaces), len(dev.Neighbors))
+
 	app.builder.AddDevice(*dev)
 
 	// 保存到数据库
 	if app.storage != nil {
 		if err := app.storage.SaveDevice(dev); err != nil {
-			log.Printf("Warning: failed to save device to database: %v", err)
+			log.Printf("Error: failed to save device %s to database: %v", req.IP, err)
+		} else {
+			log.Printf("Device %s saved to database successfully", req.IP)
 		}
 	}