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

Dockerfile.worker

@@ -0,0 +1,16 @@
+FROM node:22-alpine
+
+WORKDIR /app
+
+COPY package.json package-lock.json ./
+COPY worker/package.json worker/package.json
+COPY packages/shared/package.json packages/shared/package.json
+
+RUN npm ci --omit=dev
+
+COPY worker/ ./worker/
+COPY packages/shared/ ./packages/shared/
+
+ENV NODE_ENV=production
+
+CMD ["node", "worker/index.js"]