✨ feat: implement guestbook feature with routes, controller, and view

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[gitstream-cm]

 /:\ gitStream DRY RUN 

linearb/linearb_ai_review

• add code-review comment:

✨ PR Review

The PR implements a basic guestbook feature but has critical security vulnerabilities and lacks proper data persistence. The implementation needs security hardening and better data management.

3 issues detected:

🔒 Security - User input is rendered as raw HTML without sanitization, enabling XSS attacks

Details: The guestbook view uses unescaped HTML output with the != operator, which allows user-submitted content to be rendered as HTML. This creates a direct XSS vulnerability where malicious users can inject scripts that will execute in other users' browsers.
File: views/guestbook.pug (11-11)

🔒 Security - User input is accepted and stored without any validation or sanitization checks

Details: The controller accepts and stores user input without any validation or sanitization. This could lead to storage of malicious content, empty messages, or extremely large payloads that could impact system performance.
File: controllers/guestbook.js (8-8)

🐞 Bug - Guestbook data is stored in memory and will be lost on application restart

Details: The guestbook entries are stored in an in-memory array that will be lost when the application restarts. This means all guestbook entries will disappear on server restart, which is likely not the intended behavior for a guestbook feature.
File: controllers/guestbook.js (1-1)

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