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/index.js

@@ -0,0 +1,6 @@
+module.exports =
+{
+  parallel      : require('./parallel.js'),
+  serial        : require('./serial.js'),
+  serialOrdered : require('./serialOrdered.js')
+};