Refactor CORS configuration and add utility, update package.json for dev start command, and create GraphQL query/mutation files

package.json

@@ -9,7 +9,7 @@
     "build": "nest build",
     "format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"",
     "start": "nest start",
-    "start:dev": "nest start --watch",
+    "start:dev": "npm run prisma:generate && nest start --watch",
     "start:debug": "nest start --debug --watch",
     "start:prod": "node dist/main",
     "prisma:generate": "npx prisma generate --schema=./epess-database/prisma/schema.prisma",