🛡️ Sentinel: [HIGH] Fix CSRF vulnerability

[rauhmaru]

🚨 Severity: HIGH
💡 Vulnerability: The application was missing Cross-Site Request Forgery (CSRF) protection on forms that make state-changing requests, allowing potential malicious actors to submit forms on behalf of logged-in users.
🎯 Impact: Attackers could trick users into performing unwanted actions such as modifying or deleting cocktails and products.
🔧 Fix: Added Flask-WTF dependency to requirements.txt. Initialized CSRFProtect(app) in app.py. Added <input type="hidden" name="csrf_token" value="{{ csrf_token() }}"/> to all <form method="post"> declarations in templates. Updated tests configuration to disable CSRF (app.config['WTF_CSRF_ENABLED'] = False).
✅ Verification: Ran test suite with pytest and verified passing. Inspected pages to confirm token insertion.

---

PR created automatically by Jules for task 4627786122809232293 started by @rauhmaru

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.