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

[Snider]

🚨 Severity: CRITICAL
💡 Vulnerability: A hardcoded token xrpc-9f8e7d6c5b4a was discovered in server-php/config/conf.d/wordpress.conf which allowed bypassing the block on the /xmlrpc.php endpoint.
🎯 Impact: Anyone discovering this token in the codebase could access the XML-RPC endpoint, facilitating brute-force credential attacks or pingback DDoS reflection attacks against the server.
🔧 Fix: Removed the conditional check and the hardcoded secret. Replaced it with an unconditional deny all; block for /xmlrpc.php, while turning off access_log and log_not_found to prevent log noise from automated scans.
✅ Verification: The configuration has been visually verified. During deployment, Nginx will correctly return a 403 Forbidden for all requests to /xmlrpc.php regardless of query parameters.

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PR created automatically by Jules for task 4039167461946756947 started by @Snider

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