chore: add business logic

package.json

@@ -49,7 +49,6 @@
     "@nestjs/core": "^11.0.1",
     "@nestjs/jwt": "^11.0.0",
     "@nestjs/passport": "^11.0.5",
-    "@nestjs/platform-express": "^11.0.1",
     "@nestjs/platform-fastify": "^11.1.0",
     "@nestjs/swagger": "^11.2.0",
     "@nestjs/throttler": "^6.4.0",
@@ -80,7 +79,6 @@
     "@swc/cli": "^0.6.0",
     "@swc/core": "^1.10.7",
     "@types/bcrypt": "^5.0.2",
-    "@types/express": "^5.0.0",
     "@types/jest": "^29.5.14",
     "@types/node": "^22.10.7",
     "@types/nodemailer": "^6.4.17",