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/exit/test/fixtures/create-files.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+rm 10*.txt
+for n in 10 100 1000; do
+  node log.js 0 $n stdout stderr &> $n-stdout-stderr.txt
+  node log.js 0 $n stdout &> $n-stdout.txt
+  node log.js 0 $n stderr &> $n-stderr.txt
+done