🛡️ Sentinel: [HIGH] Fix authorization bypass in API

[arumes31]

🚨 Severity: HIGH
💡 Vulnerability: Privilege escalation through resetting the main system administrator's (GUIAdmin) TOTP token via the UI.
🎯 Impact: A compromised lower-privileged admin account (or a rogue operator) could reset the GUIAdmin TOTP and take over the system, compromising the entire blocklist application.
🔧 Fix: Explicitly check if req.Username == h.cfg.GUIAdmin in the ChangeAdminTOTP handler and return a 403 Forbidden response to prevent the UI-driven reset, mirroring the protection already in place for password resets.
✅ Verification: Review the code diff ensuring the check halts execution. Tested locally via go test -short ./internal/api.

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PR created automatically by Jules for task 17452467486168143190 started by @arumes31

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