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/@sinonjs/commons/lib/global.test.js

@@ -0,0 +1,16 @@
+"use strict";
+
+var assert = require("@sinonjs/referee-sinon").assert;
+var globalObject = require("./global");
+
+describe("global", function () {
+    before(function () {
+        if (typeof global === "undefined") {
+            this.skip();
+        }
+    });
+
+    it("is same as global", function () {
+        assert.same(globalObject, global);
+    });
+});