fix: correct tutorial Step 2 to SSH as root before bootstrap

The deploy user doesn't exist until bootstrap runs in Step 3, so
Step 2 should instruct users to SSH as root to verify access.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: baijum

docs/tutorial.md

@@ -39,12 +39,12 @@ cd app-template
 Create a Debian server from your preferred provider. Make sure:
 
 - Ports **22**, **80**, and **443** are open in the firewall
-- You can SSH in as a non-root user with sudo access
+- You can SSH in as root (or the user your provider creates)
 
 Verify access:
 
 ```bash
-ssh deploy@YOUR_SERVER_IP
+ssh root@YOUR_SERVER_IP
 ```
 
 You should see a shell prompt. If this works, you are ready to bootstrap.