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/resolve/SECURITY.md

@@ -0,0 +1,13 @@
+# Security
+
+Please [file a private vulnerability report](https://github.com/browserify/resolve/security/advisories/new),
+or email [@ljharb](https://github.com/ljharb),
+if you have a potential security vulnerability to report.
+
+## Incident Response
+
+See our [Incident Response Process](.github/INCIDENT_RESPONSE_PROCESS.md).
+
+## Threat Model
+
+See [THREAT_MODEL.md](./THREAT_MODEL.md).