🛡️ Sentinel: Fix Information Disclosure in Authentication Decorator

[Pmaster-dev]

🛡️ Sentinel: Fix Information Disclosure in Authentication Decorator

• Severity: MEDIUM
• Vulnerability: Unhandled exception messages (str(e)) were being leaked in HTTP 401 response payloads inside auth/utils.py's login_required decorator.
• Impact: Attackers could force authentication errors to inspect database/Redis connection details, key mismatches, or internal stack details.
• Fix: Sanitized the response to return a generic {'error': 'Unauthorized'} payload while logging the detailed exception internally via logger.error. Added test coverage in tests/test_auth.py.

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PR created automatically by Jules for task 293209700619754762 started by @Pmaster-dev

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