feat: support CDN reverse proxy for MidJourney and OpenAI API

api/store/model/function.go

@@ -3,6 +3,7 @@ package model
 type Function struct {
 	Id          uint `gorm:"primarykey;column:id"`
 	Name        string
+	Label       string
 	Description string
 	Parameters  string
 	Required    string

api/store/model/mj_job.go

@@ -15,6 +15,7 @@ type MidJourneyJob struct {
 	Hash        string // message hash
 	Progress    int
 	Prompt      string
+	UseProxy    bool // 是否使用反代加载图片
 	CreatedAt   time.Time
 }