#10: implement Cloudflare DNS automation engine (13 records & system aliases)

services/protocols/internal/application/port/dns_provider.go

@@ -0,0 +1,16 @@
+package port
+
+import (
+	"context"
+
+	"lambdamail/protocols/internal/domain/entity"
+)
+
+// DnsProvider defines operations for managing remote DNS zone records (e.g. Cloudflare).
+type DnsProvider interface {
+	GetZoneID(ctx context.Context, domainName string) (string, error)
+	ListRecords(ctx context.Context, zoneID string) ([]entity.DnsRecord, error)
+	CreateRecord(ctx context.Context, zoneID string, record entity.DnsRecord) error
+	UpdateRecord(ctx context.Context, zoneID string, record entity.DnsRecord) error
+	DeleteRecord(ctx context.Context, zoneID string, recordID string) error
+}