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.

Dockerfile

@@ -1,11 +1,15 @@
 # syntax=docker/dockerfile:1
 
 FROM node:22-bookworm-slim AS frontend-builder
-WORKDIR /app/frontend
-COPY frontend/package.json frontend/package-lock.json ./
-RUN npm ci
-COPY frontend/ ./
-RUN npm run build
+WORKDIR /app
+RUN corepack enable
+COPY package.json pnpm-workspace.yaml pnpm-lock.yaml ./
+COPY apps/web/package.json apps/web/
+COPY packages/ui/package.json packages/ui/
+RUN pnpm install --frozen-lockfile
+COPY apps/web apps/web
+COPY packages/ui packages/ui
+RUN pnpm --filter web build
 
 FROM rust:1.85-bookworm AS backend-builder
 WORKDIR /app
@@ -13,7 +17,7 @@ RUN apt-get update && apt-get install -y pkg-config libssl-dev && rm -rf /var/li
 COPY backend/Cargo.toml backend/Cargo.lock* ./backend/
 COPY backend/migrations ./backend/migrations/
 COPY backend/src ./backend/src/
-COPY --from=frontend-builder /app/frontend/dist ./static/
+COPY --from=frontend-builder /app/apps/web/dist ./static/
 WORKDIR /app/backend
 ENV STATIC_DIR=/app/static
 RUN cargo build --release
@@ -22,7 +26,7 @@ FROM debian:bookworm-slim AS runtime
 RUN apt-get update && apt-get install -y ca-certificates && rm -rf /var/lib/apt/lists/*
 WORKDIR /app
 COPY --from=backend-builder /app/backend/target/release/cfdm-backend /app/cfdm-backend
-COPY --from=frontend-builder /app/frontend/dist /app/static
+COPY --from=frontend-builder /app/apps/web/dist /app/static
 COPY VERSION /app/VERSION
 ENV STATIC_DIR=/app/static
 ENV DATABASE_URL=sqlite:/data/app.db