**SECTION 3: `/vendors`**.  
This is where each vendor‑specific provisioning module lives. Every file follows the same structure:

- Load vendor config  
- Open SSH connection  
- Run provisioning commands  
- Return a standardized response array  
- Log events for audit trail  

Each module will contain:

- SSH connection  
- Provisioning commands  
- Error handling  
- Return structure  

You’ll get:

- `vendor_calix.php`
- `vendor_cambium.php`
- `vendor_zyxel.php`
- `vendor_ubiquiti.php`
- `vendor_adtran.php`
- `vendor_mikrotik.php`

Each module uses the same interface:

```php
provision_device($ip, $username, $password, $serviceProfile)
```

and returns:

```php
[
    'success' => true/false,
    'output'  => "... raw device output ...",
    'error'   => null or "error message"
]
```

---

Everything is clean, modular, and ready to plug into the universal provisioning engine.