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/ServiceRequiredPortTest.php

@@ -2,7 +2,6 @@
 
 use App\Models\Service;
 use App\Models\ServiceApplication;
-use Mockery;
 
 it('returns required port from service template', function () {
     // Mock get_service_templates() function