Dev test scripts

This folder contains developer utilities for testing invoice and PDF generation.

Files:
- `test_invoice_workflow.php` - creates a dev invoice and writes a PDF to `storage/documents/`. It intentionally does not delete created records to allow inspection.

Usage:
```bash
php scripts/dev/test_invoice_workflow.php
```

Notes:
- Run only in a development environment.
- Requires database config in `config/config.php` and existing schema.
