fix: Preserve sub-namespace when generating Entity from Model (--return=entity)

[xgrind]

This change ensures that when a model is generated with --return=entity,
the Entity generator is invoked with the fully-qualified entity class name
so any sub-namespace in the model name (for example Admin) is preserved
in the Entity file and namespace.

How to reproduce (before fix)

1. Run: php spark make:model Admin/Class --return entity
2. Model is created under app/Models/Admin/Class.php
3. Entity is created under app/Entities/Class.php (missing Admin namespace)

How to verify (after applying fix)

1. Run: php spark make:model Admin/Class --return entity
2. Model: app/Models/Admin/Class.php
3. Entity: app/Entities/Admin/Class.php (namespace App\Entities\Admin)

[mergeable]

Hi there, xgrind! 👋

Thank you for sending this PR!

We expect the following in all Pull Requests (PRs).

• PRs must be sent to the appropriate branch
• All git commits must be GPG-signed
• Must follow our style guide
• Be commented in the PHP source file
• Be documented in the user guide
• Be unit tested
• Pass all checks in GitHub Actions

Important

We expect all code changes or bug-fixes to be accompanied by one or more tests added to our test suite to prove the code works.

If pull requests do not comply with the above, they will likely be closed. Since we are a team of volunteers, we don't have any more time to work
on the framework than you do. Please make it as painless for your contributions to be included as possible.

See https://github.com/codeigniter4/CodeIgniter4/blob/develop/contributing/pull_request.md

Sincerely, the mergeable bot 🤖

[paulbalandan]

Please add a test showing the fix works.

[xgrind]

// before the fix
[michael@desktop CodeIgniter4 (develop)]$ php spark make:model admin/class --return entity

CodeIgniter v4.7.3-dev Command Line Tool - Server Time: 2026-05-23 14:24:35 UTC+00:00

File created: APPPATH/Entities/Class.php

File created: APPPATH/Models/Admin/Class.php

---

// after the fix
[michael@desktop CodeIgniter4 (develop)]$ php spark make:model admin/class --return entity

CodeIgniter v4.7.3-dev Command Line Tool - Server Time: 2026-05-23 14:27:11 UTC+00:00

File created: APPPATH/Entities/Admin/Class.php

File created: APPPATH/Models/Admin/Class.php