🛡️ Sentinel: [HIGH] Fix path traversal vulnerability

[mleem97]

🚨 Severity: HIGH
💡 Vulnerability: The SetPortrait method in CustomEmployeeManager constructs a file path using employeeId without validation.
🎯 Impact: Bypassing registration checks via direct calls or deserialization could lead to unauthorized file access outside the sandbox.
🔧 Fix: Added explicit path traversal validation using IndexOfAny and Contains("..") to SetPortrait. Wrapped the file access in a conditional block to ensure fallback logic remains reachable.
✅ Verification: Verified code compilation and test execution.

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PR created automatically by Jules for task 14589995172888592335 started by @mleem97

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[codacy-production]

Up to standards ✅

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