Dmytro Kravchenko - coding exercise

[krav4enkodm]

Screenshots	Screenshots

This PR establishes the frontend baseline and developer workflow for the interview app.

What changed

• Added internal app pages (dashboard, customers, vehicles, repair-orders) with shared UI primitives.
• Added Next.js API routes and OpenAPI generation from Zod, plus generated API types and openapi-react-query integration.
• Introduced app-level ErrorBoundary with retry fallback UI.
• Added/expanded mock data and tuned React Query caching behavior.
• Added Storybook config and initial component stories.
• Added Vitest + React Testing Library setup with unit tests for core components/utilities.
• Added Docker setup (frontend/Dockerfile, root docker-compose.yml) and updated Next.js config.
• Added formatting/quality tooling (Prettier, lint-staged, Husky pre-commit).
• Refactored frontend module structure (components/lib) and updated imports/OpenAPI generation paths.