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/asynckit/lib/readable_serial.js

@@ -0,0 +1,25 @@
+var serial = require('../serial.js');
+
+// API
+module.exports = ReadableSerial;
+
+/**
+ * Streaming wrapper to `asynckit.serial`
+ *
+ * @param   {array|object} list - array or object (named list) to iterate over
+ * @param   {function} iterator - iterator to run
+ * @param   {function} callback - invoked when all elements processed
+ * @returns {stream.Readable#}
+ */
+function ReadableSerial(list, iterator, callback)
+{
+  if (!(this instanceof ReadableSerial))
+  {
+    return new ReadableSerial(list, iterator, callback);
+  }
+
+  // turn on object mode
+  ReadableSerial.super_.call(this, {objectMode: true});
+
+  this._start(serial, list, iterator, callback);
+}