Add DDNS support (#324)

* feat: add ddns updater framework

Note: no functionality implemented yet

* feat: add webhook ddns provider

* feat: update dashboard template

* fix: check nil and cron task string

* fix: webhook string formated with unexcepted param

* fix: webhook header split error

* feat: cloudflare ddns provider

* refract: move ddns update trigger into ReportSystemInfo

* lang: update other languages text

* fix: clear codes and logics

* fix: move update ddns to goroutine to avoid blocking

* fix: clear unused codes

* fix: update timestamp to prevent cache

cmd/dashboard/controller/member_api.go

@@ -300,6 +300,8 @@ type serverForm struct {
 	Tag          string
 	Note         string
 	HideForGuest string
+	EnableDDNS   string
+	DDNSDomain   string
 }
 
 func (ma *memberAPI) addOrEditServer(c *gin.Context) {
@@ -315,6 +317,8 @@ func (ma *memberAPI) addOrEditServer(c *gin.Context) {
 		s.Tag = sf.Tag
 		s.Note = sf.Note
 		s.HideForGuest = sf.HideForGuest == "on"
+		s.EnableDDNS = sf.EnableDDNS == "on"
+		s.DDNSDomain = sf.DDNSDomain
 		if s.ID == 0 {
 			s.Secret, err = utils.GenerateRandomString(18)
 			if err == nil {