chore: change seed script to use compiled JS instead of ts-node

- Update package.json to run node scripts/seed.js instead of ts-node scripts/seed.ts
- Rewrite seed.js to use compiled model from dist/ directory and Sequelize directly
- Add proper error handling and database connection setup
- Ensure script works after build, requiring npm run build first

package.json

@@ -7,7 +7,7 @@
     "build": "tsc",
     "start": "node dist/main.js",
     "start:dev": "nodemon --watch 'src/**/*.ts' --exec \"ts-node\" src/main.ts",
-    "seed": "ts-node scripts/seed.ts"
+    "seed": "node scripts/seed.js"
   },
   "dependencies": {
     "@nestjs/common": "^11.1.12",
@@ -45,4 +45,4 @@
     "ts-node": "^10.9.2",
     "typescript": "^5.9.3"
   }
-}
+}