🛡️ Sentinel: [security improvement] Add fetch timeout to prevent DoS

[ImChong]

🚨 Severity: MEDIUM
💡 Vulnerability: fetch requests inside fetchParkourBundleIosPatchStatus lacked a timeout mechanism. An unresponsive endpoint could cause the promise to hang indefinitely, consuming resources and potentially causing a Denial of Service (DoS).
🎯 Impact: Prevents the application/UI thread from hanging indefinitely due to slow or unresponsive network requests.
🔧 Fix: Introduced an AbortController with a 10-second timeout wrapping the fetch calls. Added a finally block to clear the timeout and prevent memory leaks.
✅ Verification: Verified via manual review and by ensuring the test suite passes (pnpm test ok).

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PR created automatically by Jules for task 11515097193736564760 started by @ImChong

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