feat: initialize full ysterbaard frontend application
Add complete production-ready Ysterbaard PocketBase registry browser frontend:
- Next.js 14 App Router with TypeScript, Tailwind CSS, and TanStack React Query
- Secure server-side PocketBase API proxy to avoid exposing superuser tokens
- Read-only directors and companies registry browse pages with search, filtering, and pagination
- Client onboarding workflow for creating and managing client submissions
- Docker container configuration for easy deployment
- All supporting UI components, utility functions, and configuration files
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