🛡️ Sentinel: [CRITICAL] Fix Path Traversal in Image Loading

[mleem97]

• 🚨 Severity: CRITICAL
• 💡 Vulnerability: CustomEmployeeManager.SetPortrait lacked defense-in-depth validation for employeeId when constructing file paths via Path.Combine, allowing Path Traversal (CWE-22) via indirect calls or deserialization bypasses.
• 🎯 Impact: Arbitrary file read of local system files by escaping the ModAssets sandbox directory.
• 🔧 Fix: Added explicit path traversal character checks (IndexOfAny and Contains("..")) inside SetPortrait before invoking Path.Combine.
• ✅ Verification: Verified using dotnet build and dotnet test. Checked modified method.

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PR created automatically by Jules for task 12382956418004603821 started by @mleem97

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[codacy-production]

Up to standards ✅

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