Populate record identifiers during migration

Backfill existing subdomains before enforcing the non-null effective record identifier and guard missing SRV service types.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: NebuloDev

subdomains/database/migrations/011_allow_compatible_record_types.php

@@ -16,6 +16,7 @@ public function up(): void
         });
 
         Subdomain::query()->with('server')->each(function (Subdomain $subdomain) {
+            $subdomain->record_identifier = $subdomain->record_type->uniqueIdentifier($subdomain->server);
             $subdomain->saveQuietly();
         });
 

subdomains/src/Enums/RecordType.php

@@ -26,7 +26,9 @@ public function uniqueIdentifier(Server $server): string
             return $this->value;
         }
 
-        return SRVServiceType::fromServer($server)->value ?? 'SRV';
+        $serviceType = SRVServiceType::fromServer($server);
+
+        return $serviceType ? $serviceType->value : 'SRV';
     }
 
     /**