🛡️ Sentinel: [HIGH] Fix Server-Side Request Forgery (SSRF) in background workers

[frkr]

🚨 Severity: HIGH
💡 Vulnerability: Background workers (MQDestiny.ts and MQCallback.ts) were susceptible to Server-Side Request Forgery (SSRF). They fetched user-provided dynamic URLs (destiny and callback) retrieved from JSON configs in R2, but did not validate the protocol. This allowed attackers to potentially use schemes like file:// or gopher:// to access unauthorized local files or interact with internal systems.
🎯 Impact: Potential unauthorized access to internal resources, sensitive data exposure, or server compromise.
🔧 Fix: Added explicit protocol validation (http: and https:) in MQDestiny.ts and MQCallback.ts using new URL() to prevent Server-Side Request Forgery (SSRF) attacks when executing fetch against dynamically provided URLs. Messages with invalid protocols are gracefully marked as error to avoid infinite retry loops. Also recorded the security finding in the .jules/sentinel.md journal.
✅ Verification: Unit tests passed verifying no regressions in the task runner. Try providing a file:// or ftp:// scheme in a dynamic destiny or callback configuration; the worker should properly reject the URL and save an error state.

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PR created automatically by Jules for task 17945132342917951522 started by @frkr

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