test(factories): add missing model factories for app test suite

Enable `HasFactory` on `Environment`, `Project`, `ScheduledTask`, and
`StandaloneDocker`, and add dedicated factories for related models to
stabilize feature/unit tests.

Also bump `visus/cuid2` to `^6.0` and refresh `composer.lock` with the
resulting dependency updates.

tests/Unit/ApplicationComposeEditorLoadTest.php

@@ -3,7 +3,6 @@
 use App\Models\Application;
 use App\Models\Server;
 use App\Models\StandaloneDocker;
-use Mockery;
 
 /**
  * Unit test to verify docker_compose_raw is properly synced to the Livewire component