🛡️ Sentinel: [HIGH] Fix Server-Side Request Forgery (SSRF) in Async Message Queues

[frkr]

🚨 Severity: HIGH
💡 Vulnerability: Server-Side Request Forgery (SSRF) could occur if a malicious or malformed destiny or callback URL (e.g., using protocols like file:// or ftp://) were placed into a message, which would then be fetched by the background worker processes in MQDestiny.ts and MQCallback.ts.
🎯 Impact: An attacker could potentially coerce the Cloudflare Worker into probing internal resources, fetching unintended local files/network resources, or exploiting vulnerabilities in internal endpoints.
🔧 Fix: Added strict protocol validation (http: or https:) using the standard new URL(urlString) constructor in both MQDestiny.ts and MQCallback.ts. If an unauthorized protocol is supplied, the message is gracefully flagged with an error status in the MQStore and processing is aborted without retrying.
✅ Verification: Ran pnpm run test and successfully verified that all 55 existing tests continue to pass. The fix has no unintended side effects on normal operations while significantly mitigating SSRF risks.

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PR created automatically by Jules for task 9238220874226673192 started by @frkr

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