🛡️ Sentinel: [MEDIUM] Fix error handling to prevent sensitive data leakage

[AGI-Corporation]

🚨 Severity: MEDIUM
💡 Vulnerability: FastAPIs HTTPException handlers in agents/mistral_agent/agent.py were catching generic exceptions and returning str(e) directly to clients. This could leak sensitive information, such as API key errors, file paths, or backend infrastructure details.
🎯 Impact: External users or attackers could gain insight into internal system mechanics, aiding in further attacks.
🔧 Fix: Imported the logging module. Changed the exception blocks to log the true error server-side via logging.error() and raise an HTTPException with a generic detail="Internal server error" string to the client.
✅ Verification: Ran the full backend test suite (python -m pytest) to ensure the agent endpoints still function correctly and the error handling changes didn't break existing tests.

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PR created automatically by Jules for task 8342296142157463871 started by @AGI-Corporation

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