🛡️ Sentinel: [HIGH] Fix path traversal in SetPortrait

[mleem97]

🚨 Severity: HIGH
💡 Vulnerability: Path traversal in SetPortrait where employeeId is unsanitized when constructing image paths via Path.Combine.
🎯 Impact: Allows arbitrary local file reading or existence checks by manipulating the employeeId string to contain .. or other invalid characters.
🔧 Fix: Added path traversal validation using Path.GetInvalidFileNameChars() and a .. check wrapped in an if/else condition (preventing early returns to preserve fallback behavior) before attempting to read the file.
✅ Verification: Ran dotnet build and dotnet test and ensured build succeeds and tests pass.

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PR created automatically by Jules for task 730321041628937721 started by @mleem97

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[codacy-production]

Up to standards ✅

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