🛡️ Sentinel: [MEDIUM] Add X-XSS-Protection header

[arumes31]

🚨 Severity: MEDIUM
💡 Vulnerability: Missing X-XSS-Protection header.
🎯 Impact: While modern browsers have deprecated this header in favor of Content Security Policy (CSP), omitting it leaves older browsers without a defense-in-depth layer against reflected cross-site scripting (XSS) attacks.
🔧 Fix: Added c.Header("X-XSS-Protection", "1; mode=block") in the securityHeadersMiddleware.
✅ Verification: git diff shows the header is added to the response headers alongside X-Content-Type-Options. Tests are passing.

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PR created automatically by Jules for task 2357529351367592711 started by @arumes31

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