feat: update port configurations for backend and frontend; adjust Dockerfile and docker-compose settings

backend/Dockerfile

@@ -7,6 +7,6 @@ RUN npm install
 
 COPY . .
 
-EXPOSE 3001
+EXPOSE 7001
 
 CMD ["npm", "start"]

backend/server.js

@@ -3,7 +3,7 @@ import cors from "cors";
 import env from "dotenv";
 env.config();
 const app = express();
-const port = 3001;
+const port = 7001;
 
 app.use(cors());
 app.use(express.urlencoded({ extended: true }));