fix: copy templates

Author: Junyi-99

package.json

@@ -10,7 +10,7 @@
     "test": "jest",
     "test:coverage": "jest --coverage",
     "start": "ts-node src/app.ts",
-    "build": "tsc",
+    "build": "tsc && cp -r src/templates dist/",
     "serve": "node dist/app.js"
   },
   "devDependencies": {