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/buffer-equal-constant-time/package.json

@@ -0,0 +1,21 @@
+{
+  "name": "buffer-equal-constant-time",
+  "version": "1.0.1",
+  "description": "Constant-time comparison of Buffers",
+  "main": "index.js",
+  "scripts": {
+    "test": "mocha test.js"
+  },
+  "repository": "git@github.com:goinstant/buffer-equal-constant-time.git",
+  "keywords": [
+    "buffer",
+    "equal",
+    "constant-time",
+    "crypto"
+  ],
+  "author": "GoInstant Inc., a salesforce.com company",
+  "license": "BSD-3-Clause",
+  "devDependencies": {
+    "mocha": "~1.15.1"
+  }
+}