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/test/dotdot.js

@@ -0,0 +1,29 @@
+var path = require('path');
+var test = require('tape');
+var resolve = require('../');
+
+test('dotdot', function (t) {
+    t.plan(4);
+    var dir = path.join(__dirname, '/dotdot/abc');
+
+    resolve('..', { basedir: dir }, function (err, res, pkg) {
+        t.ifError(err);
+        t.equal(res, path.join(__dirname, 'dotdot/index.js'));
+    });
+
+    resolve('.', { basedir: dir }, function (err, res, pkg) {
+        t.ifError(err);
+        t.equal(res, path.join(dir, 'index.js'));
+    });
+});
+
+test('dotdot sync', function (t) {
+    t.plan(2);
+    var dir = path.join(__dirname, '/dotdot/abc');
+
+    var a = resolve.sync('..', { basedir: dir });
+    t.equal(a, path.join(__dirname, 'dotdot/index.js'));
+
+    var b = resolve.sync('.', { basedir: dir });
+    t.equal(b, path.join(dir, 'index.js'));
+});