fix: restore login by defining getClientIp helper

backend/server.js

@@ -2852,6 +2852,15 @@ function normalizeClientIp(rawIp) {
   return ip;
 }
 
+function getClientIp(req) {
+  return normalizeClientIp(
+    req?.ip
+      || req?.socket?.remoteAddress
+      || req?.connection?.remoteAddress
+      || ''
+  );
+}
+
 function parseShareIpWhitelist(rawValue) {
   if (typeof rawValue !== 'string') return [];
   return rawValue