chore: initialize project with package.json, .env.example and .gitignore

Set up the Node.js project skeleton, define environment variable
template, and exclude secrets, certs, and nginx runtime from version control.

.gitignore

@@ -0,0 +1,11 @@
+# Environment secrets
+.env
+
+# SSL certificates and private keys
+deploy/certs/
+
+# Nginx runtime data
+.nginx/
+
+# Node.js
+node_modules/