fix: Update nginx config to use dynamic DNS resolution

- Replace upstream blocks with resolver directive
- Use variables for backend addresses to avoid startup errors
- Simplify configuration with single server block
- Add health check endpoint

server/api/node_modules/axios/lib/helpers/isAxiosError.js

@@ -0,0 +1,14 @@
+'use strict';
+
+import utils from '../utils.js';
+
+/**
+ * Determines whether the payload is an error thrown by Axios
+ *
+ * @param {*} payload The value to test
+ *
+ * @returns {boolean} True if the payload is an error thrown by Axios, otherwise false
+ */
+export default function isAxiosError(payload) {
+  return utils.isObject(payload) && payload.isAxiosError === true;
+}