重构代码结构，优化连接管理和日志记录

server/web/models/channel.go

@@ -0,0 +1,20 @@
+package models
+
+import (
+	"time"
+
+	"gorm.io/gorm"
+)
+
+// Channel 连接认证模型
+type Channel struct {
+	gorm.Model
+	UserId     uint
+	NodeId     uint
+	Protocol   string
+	Username   string
+	Password   string
+	AuthIp     bool
+	AuthPass   bool
+	Expiration time.Time
+}