feat: support model remap now

model/channel.go

@@ -22,6 +22,7 @@ type Channel struct {
 	Models             string  `json:"models"`
 	Group              string  `json:"group" gorm:"type:varchar(32);default:'default'"`
 	UsedQuota          int64   `json:"used_quota" gorm:"bigint;default:0"`
+	ModelMapping       string  `json:"model_mapping" gorm:"type:varchar(1024);default:''"`
 }
 
 func GetAllChannels(startIdx int, num int, selectAll bool) ([]*Channel, error) {