build: migrate to commonjs and add node single executable app support

- Switch module type to commonjs in package.json
- Update esbuild target to node22 and remove explicit ESM format flag
- Add `bin` script for building a native binary using `node --build-sea`
- Introduce sea-config.json with code cache enabled for faster startup

sea-config.json

@@ -0,0 +1,6 @@
+{
+  "main": "dist/index.js",
+  "output": "dist/lmc",
+  "useCodeCache": true,
+  "disableExperimentalSEAWarning": true
+}