🛡️ Sentinel: Prevent sensitive error detail leakage in login_required decorator

[Pmaster-dev]

🛡️ Sentinel: [MEDIUM] Prevent sensitive error detail leakage in login_required decorator

🚨 Severity: MEDIUM
💡 Vulnerability: Information Disclosure / Sensitive Error Details Leakage
🎯 Impact: Raw exception strings in login_required could leak internal stack/database details or sensitive internal variables to unauthenticated API clients.
🔧 Fix: Removed 'details': str(e) from the error response returned by login_required in auth/utils.py.
✅ Verification: Added unit test in tests/test_auth_utils.py confirming login_required returns sanitized error response without leaking details.

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PR created automatically by Jules for task 3816073396050230108 started by @Pmaster-dev

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