Refactor code structure for improved readability and maintainability

package.json

@@ -1,4 +1,29 @@
 {
   "name": "study-koa-trest",
-  "packageManager": "yarn@4.18.0"
+  "packageManager": "yarn@4.18.0",
+  "type": "module",
+  "scripts": {
+     "dev": "tsx --watch ./src/index.ts",
+  "start": "node ./dist/index.js",
+  "build": "tsc",
+  "clean": "rm -rf dist",
+  "compile": "yarn clean && yarn build",
+  "script": "tsx"
+  },
+  "dependencies": {
+    "@jig-software/trest": "2.0.0-beta",
+    "@koa/cors": "^5.0.0",
+    "@koa/router": "^15.7.0",
+    "koa": "^3.2.1",
+    "koa-bodyparser": "^4.4.1"
+  },
+  "devDependencies": {
+    "@types/koa": "^3.0.3",
+    "@types/koa-bodyparser": "^4",
+    "@types/koa__cors": "^5",
+    "@types/node": "^26.4.1",
+    "nodemon": "^3.1.14",
+    "tsx": "^4.23.13",
+    "typescript": "^5.9.3"
+  }
 }