feat: integrate MSW for API mocking and testing

- Added MSW (Mock Service Worker) for intercepting network requests in development and testing.
- Created mock data and handlers for example API responses.
- Implemented a new ExamplePage component with a button to trigger API requests.
- Updated router to include a route for the ExamplePage.
- Added tests for ExamplePage using Testing Library and Vitest, ensuring proper rendering and API interaction.
- Configured testing setup to clean up after tests and start the MSW server.
- Updated package.json to include necessary dependencies for testing and mocking.