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/get-caller-file/index.d.ts

@@ -0,0 +1,2 @@
+declare const _default: (position?: number) => any;
+export = _default;