This PR implements automatic code formatting and linting using Prettier and ESLint, as described in the issue.

What’s included:

• Installed Prettier and ESLint as dev dependencies.
• Added .prettierrc and .eslintrc configuration files with base rules.
• Added format and lint scripts in package.json.
• Added pre-commit hook using Husky to auto-format and lint on commit.
• Ran initial formatting pass across the codebase.