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

package.json

@@ -1,18 +1,19 @@
 {
   "name": "lmc",
   "module": "index.ts",
-  "type": "module",
+  "main": "dist/index.js",
+  "type": "commonjs",
   "private": true,
   "bin": {
-    "lmc": "dist/index.js",
-    "ttsc": "dist/tts.js"
+    "lmc": "dist/index.js"
   },
   "scripts": {
     "dev": "tsx index.ts",
     "prod": "node dist/index.js",
     "check": "biome check --write && pnpm run tc",
-    "build": "pnpm run check && pnpm run bundle",
-    "bundle": "esbuild index.ts --bundle --outdir=dist --platform=node --target=node18 --format=esm --packages=external",
+    "build": "pnpm run check && pnpm run bundle && pnpm run bin",
+    "bundle": "esbuild index.ts --bundle --outdir=dist --platform=node --target=node22",
+    "bin": "node --build-sea sea-config.json",
     "tc": "tsc --noEmit --incremental"
   },
   "devDependencies": {