chore(dev): add npm clean script for docker compose teardown

Replace manual docker rm steps in DEVELOPMENT.md with `npm run clean`.

package.json

@@ -7,7 +7,8 @@
         "build": "vite build",
         "typecheck": "tsc --noEmit",
         "test": "vitest run",
-        "test:watch": "vitest"
+        "test:watch": "vitest",
+        "clean": "docker compose -f docker-compose.yml -f docker-compose.dev.yml down --remove-orphans"
     },
     "devDependencies": {
         "@tailwindcss/postcss": "4.1.18",