🛡️ Sentinel: [MEDIUM] Fix inconsistent cookie deletion by enforcing Expires header alongside MaxAge

[arumes31]

🚨 Severity: MEDIUM
💡 Vulnerability: Some browsers may not correctly clear session cookies if MaxAge: -1 is supplied without an Expires date in the past, or vice-versa.
🎯 Impact: Session cookies could potentially persist longer than intended, leaving a window open for unauthorized session reuse.
🔧 Fix: Add Expires: time.Unix(0, 0) to the cookie deletion structures in internal/handlers/auth.go to explicitly enforce expiration in the past alongside MaxAge: -1.
✅ Verification: Ran go test ./... to ensure no functionality is broken and formatting passes.

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PR created automatically by Jules for task 744770133883656375 started by @arumes31

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