feat(api): add tag management endpoints for applications, databases, and services

Add CRUD tag endpoints (GET/POST/DELETE) as sub-resources for applications,
databases, and services. Add team-level GET /tags endpoint. Extend all
resource creation endpoints to accept an optional tags array.

Uses a shared HandlesTagsApi trait to avoid duplication across controllers.
Tags are race-safe via syncWithoutDetaching(), garbage-collected when orphaned,
and sanitized (strip_tags + lowercase).

bootstrap/helpers/api.php

@@ -194,4 +194,5 @@ function removeUnnecessaryFieldsFromRequest(Request $request)
     $request->offsetUnset('autogenerate_domain');
     $request->offsetUnset('is_container_label_escape_enabled');
     $request->offsetUnset('docker_compose_raw');
+    $request->offsetUnset('tags');
 }