🛡️ Sentinel: [HIGH] Fix privilege escalation in TOTP management

[arumes31]

🚨 Severity: HIGH
💡 Vulnerability: Privilege Escalation/Account Takeover risk. Admins with manage_admins permissions could use the /admin_management/change_totp or /admin_management/get_qr/:username endpoints to reset or view the TOTP secret of the system's primary root administrator (GUIAdmin), potentially leading to account takeover of the highest-privileged account.
🎯 Impact: Unauthorized access to the GUIAdmin account, leading to complete system compromise.
🔧 Fix: Added explicit checks in ChangeAdminTOTP and GetQR handlers to return a 403 Forbidden if the requested username matches the configured GUIAdmin.
✅ Verification: Verified that attempting to manage the TOTP secret of the GUIAdmin now correctly returns an error and prevents the action. Run tests using go test ./internal/api/... and ensure they pass.

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PR created automatically by Jules for task 10139628826050809997 started by @arumes31

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