fix(auth): use Cloudflare client IP for authentication rate limits

bootstrap/helpers/auth.php

@@ -0,0 +1,14 @@
+<?php
+
+use Illuminate\Http\Request;
+
+function auth_rate_limit_ip(Request $request): string
+{
+    $cloudflareIp = $request->header('CF-Connecting-IP');
+
+    if (isCloud() && is_string($cloudflareIp) && filter_var($cloudflareIp, FILTER_VALIDATE_IP) !== false) {
+        return $cloudflareIp;
+    }
+
+    return (string) $request->ip();
+}