Missing `npm install` command in README setup instructions

[Puchao64]

The current README lists the following commands:
npm run dev
npm run build
npm run start
However, it does not include the npm install step, which is required to install project dependencies before running any of the listed scripts.

🔧 Suggested fix:
Add the following line above the existing commands:
npm install
This will make the setup instructions clearer for new contributors or developers trying to run the project locally.