🛡️ Sentinel: [MEDIUM] Sanitize third-party error responses in upload API

[GerryK97]

🚨 Severity: MEDIUM
💡 Vulnerability: The image upload API endpoint (src/app/api/upload/route.ts) was leaking detailed internal infrastructure configuration (i.e. whether specific Cloudinary environment variables were set) and passing raw third-party exception objects directly to clients during failures.
🎯 Impact: Exposing server-side configuration requirements and detailed error stack traces from third-party APIs can provide malicious actors with intelligence about backend systems, making it easier to craft targeted attacks or abuse services.
🔧 Fix: Replaced the detailed JSON error payloads with generic error messages ("Image upload service configuration error" and "An error occurred during image upload"). The detailed console.error logs remain server-side for debugging purposes. Adhered strictly to failing securely.
✅ Verification: Verified by checking that the JSON response payload structure in src/app/api/upload/route.ts no longer outputs cloudinaryError or the names of missing environment variables. No regressions introduced as confirmed via static analysis checks.

Also added a journal entry in .jules/sentinel.md documenting this learning around third-party error sanitization.

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PR created automatically by Jules for task 14012016940919036688 started by @GerryK97

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Project	Deployment	Actions	Updated (UTC)
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