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/is-arrayish/.npmignore

@@ -0,0 +1,5 @@
+/coverage/
+/test.js
+/test/
+*.sw[a-p]
+/node_modules/