hotfix(publicip): return an error if trying to use cloudflare as ip provider for updating servers data

internal/provider/common/updater.go

@@ -10,8 +10,9 @@ import (
 )
 
 var (
-	ErrNotEnoughServers    = errors.New("not enough servers found")
-	ErrHTTPStatusCodeNotOK = errors.New("HTTP status code not OK")
+	ErrNotEnoughServers     = errors.New("not enough servers found")
+	ErrHTTPStatusCodeNotOK  = errors.New("HTTP status code not OK")
+	ErrIPFetcherUnsupported = errors.New("IP fetcher not supported")
 )
 
 type Fetcher interface {
@@ -33,5 +34,7 @@ type Warner interface {
 }
 
 type IPFetcher interface {
+	String() string
+	CanFetchAnyIP() bool
 	FetchInfo(ctx context.Context, ip netip.Addr) (result models.PublicIP, err error)
 }