🛡️ Sentinel: Fix exception details leakage in login_required decorator

[Pmaster-dev]

🛡️ Sentinel: Fix exposed exception details in authentication errors

Vulnerability

In auth/utils.py, when login_required failed due to an exception, the JSON error response included 'details': str(e), exposing internal implementation details and raw error messages to unauthenticated users.

Fix

• Removed 'details': str(e) from the 401 response payload.
• Added internal exception logging using logger.exception.
• Added unit tests in tests/test_auth.py to verify that unauthorized requests return standard error responses without leaking exception details.

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PR created automatically by Jules for task 8388778677498683575 started by @Pmaster-dev

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