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/10-stderr.txt

@@ -0,0 +1,10 @@
+stderr 0
+stderr 1
+stderr 2
+stderr 3
+stderr 4
+stderr 5
+stderr 6
+stderr 7
+stderr 8
+stderr 9