🛡️ Sentinel: [CRITICAL] Fix hardcoded XML-RPC secret bypass

[Snider]

🚨 Severity: CRITICAL
💡 Vulnerability: A hardcoded bypass token (xrpc-9f8e7d6c5b4a) was embedded in the Nginx configuration, which allowed conditional access to the WordPress /xmlrpc.php endpoint. Storing secrets in infrastructure configs committed to source control is a critical security vulnerability.
🎯 Impact: Any user or attacker who finds the repository code can extract the secret and gain access to the XML-RPC endpoint, opening the site to brute-force and DDoS amplification attacks.
🔧 Fix: Removed the insecure bypass logic and unconditionally blocked the endpoint using deny all;. Also disabled access_log and log_not_found for this endpoint to prevent log bloat.
✅ Verification: Verify visually that the xmlrpc.php location block simply contains deny all;. YAML parsing checks have been executed successfully on configuration files. Nginx syntax manually reviewed.

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PR created automatically by Jules for task 2813001441252554304 started by @Snider

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