chore: Add devcontainer config

Author: nandenjin

.devcontainer/devcontainer.json

@@ -0,0 +1,9 @@
+{
+  "name": "Node.js & TypeScript",
+  "image": "mcr.microsoft.com/devcontainers/typescript-node:24-bookworm",
+  "customizations": {
+    "vscode": {
+      "extensions": ["esbenp.prettier-vscode"]
+    }
+  }
+}