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.

package.json

@@ -0,0 +1,14 @@
+{
+  "name": "local-kanban",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "node src/server.js",
+    "start": "node src/server.js",
+    "test": "node --test"
+  },
+  "engines": {
+    "node": ">=20"
+  }
+}