🛡️ Sentinel: [CRITICAL] Fix hardcoded secret bypass for xmlrpc.php

[Snider]

🚨 Severity: CRITICAL
💡 Vulnerability: A hardcoded secret token was present in the Nginx configuration, providing a backdoor to bypass the default block on /xmlrpc.php. If discovered, this would allow an attacker to make arbitrary XML-RPC requests against the WordPress multisite.
🎯 Impact: XML-RPC endpoints are frequently targeted for brute-force attacks against credentials, pingback-based DDoS amplification, and cross-site port scanning. The hardcoded token exposed the cluster to these risks.
🔧 Fix: Replaced the conditional bypass with an unconditional deny all; directive, permanently blocking access to /xmlrpc.php without exposing the secret.
✅ Verification: Verified by inspecting the Nginx configuration file (server-php/config/conf.d/wordpress.conf) to ensure the hardcoded token and logic were entirely removed.

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PR created automatically by Jules for task 778591240712713494 started by @Snider

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