refactor: migrate to monorepo structure with Docker, PocketBase, and e2e tests

- Reorganize into apps/, packages/, docs/, e2e/, pocketbase/ directories
- Add Dockerfiles for web, worker, and PocketBase services
- Add docker-compose.yml for local orchestration
- Add turbo.json for monorepo task management
- Add Playwright e2e test infrastructure
- Add PocketBase backend with migrations
- Remove Vite/Next.js/ESLint/PostCSS config files
- Update package.json with workspace dependencies
- Add .env.example and .dockerignore

apps/web/lib/react-grid-layout.ts

@@ -0,0 +1,4 @@
+// This file intentionally left minimal.
+// react-grid-layout types are handled inline in the dashboard page component
+// due to @types/react-grid-layout's `export =` pattern not playing well
+// with bundler moduleResolution.