fix: harden Vultr create, Gmail identity, and provider retries

Wrap Vultr server creation in DB transactions and delete the remote
instance when local persistence fails (API and Livewire). Scope
plus/dot email normalization to gmail.com/googlemail.com only.
Use throw:false on DigitalOcean/Vultr HTTP retries, and normalize
service log line counts via normalizeLogLines.

app/Http/Controllers/Api/ServiceDatabasesController.php

@@ -311,7 +311,7 @@ class ServiceDatabasesController extends Controller
             return response()->json(['message' => 'Service database container is not running.'], 400);
         }
 
-        $lines = (int) ($request->query('lines', 100) ?: 100);
+        $lines = normalizeLogLines($request->query('lines'));
 
         return response()->json([
             'logs' => getContainerLogs($server, $containerName, $lines),