Change Android login to username/password

- Add POST /api/auth/login endpoint on server side
- Update Android login screen to username/password fields
- Hardcode production URL https://servermanager.devlab.lat
- Rebuild APK with login changes

routes/web.php

@@ -101,5 +101,6 @@ $router->put('/api/servers/:id', [ApiController::class, 'serverUpdate']);
 $router->delete('/api/servers/:id', [ApiController::class, 'serverDelete']);
 $router->get('/api/servers/:id/metrics', [ApiController::class, 'serverMetrics']);
 $router->post('/api/servers/:id/execute', [ApiController::class, 'executeCommand']);
+$router->post('/api/auth/login', [ApiController::class, 'login']);
 $router->get('/api/users', [ApiController::class, 'users']);
 $router->get('/api/refresh-metrics', [ApiController::class, 'refreshAllMetrics']);