Refactor project structure to use pnpm monorepo; update Dockerfile and related configurations for frontend build process. Adjust .dockerignore and .gitignore to reflect new paths. Modify .env.example for cron job timing. Update CONTRIBUTING.md and README.md for new development instructions.

README.md

@@ -24,9 +24,19 @@ Open http://localhost:8080 — default login `admin` / `admin` (dev only).
 ## Stack
 
 - **Backend:** Rust, Axum, sqlx, SQLite
-- **Frontend:** React, Vite, TanStack Router/Query/Table, shadcn-style UI, Recharts
+- **Frontend:** pnpm monorepo (`apps/web` + `packages/ui`), React, Vite, TanStack Router/Query/Table, shadcn/ui (base-nova), Recharts
 - **CI:** Gitea Actions (Gitflow)
 
+## Frontend development
+
+```bash
+pnpm install
+pnpm --filter web dev    # http://localhost:5173, proxies /api → :8080
+pnpm --filter web build
+```
+
+shadcn CLI: `cd apps/web && pnpm dlx shadcn@latest add <component>`
+
 ## Documentation
 
 See [docs/Home.md](docs/Home.md) and [CONTRIBUTING.md](CONTRIBUTING.md).