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/yaml/dist/schema/common/string.js

@@ -0,0 +1,16 @@
+'use strict';
+
+var stringifyString = require('../../stringify/stringifyString.js');
+
+const string = {
+    identify: value => typeof value === 'string',
+    default: true,
+    tag: 'tag:yaml.org,2002:str',
+    resolve: str => str,
+    stringify(item, ctx, onComment, onChompKeep) {
+        ctx = Object.assign({ actualString: true }, ctx);
+        return stringifyString.stringifyString(item, ctx, onComment, onChompKeep);
+    }
+};
+
+exports.string = string;