chore: cleanup some code (#1069)

* chore

* modernize loop

* ddns: simpify Provider struct

model/common.go

@@ -116,7 +116,7 @@ func searchByIDPri[S ~[]E, E CommonInterface](seq iter.Seq[string], x S) S {
 	var class E
 	split, ok := any(class).(splitter[S, E])
 	if !ok {
-		return nil
+		return x
 	}
 
 	plist, list2 := split.SplitList(x)

model/ddns.go

@@ -35,7 +35,7 @@ type DDNSProfile struct {
 	DomainsRaw         string   `json:"-"`
 }
 
-func (d DDNSProfile) TableName() string {
+func (d *DDNSProfile) TableName() string {
 	return "ddns"
 }