**SECTION 2: `/inc`**.  
This is the backbone of your ISP automation platform: database loader, authentication, API token validation, helpers, session handling, and logging.
Everything here is production‑ready, dependency‑free, and consistent with the architecture we’ve been building.
- `db.php`  
- `auth.php`  
- `api_auth.php`  
- `helpers.php`  
- `session.php`  
- `logger.php`