build: dockerize app, migrate on boot

Dockerfile

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+FROM node:22-alpine AS frontend-builder
+WORKDIR /frontend
+RUN npm install -g pnpm@10
+COPY frontend/package.json frontend/pnpm-lock.yaml ./
+RUN pnpm install --frozen-lockfile
+COPY frontend/ ./
+RUN pnpm build
+
+FROM rust:1-bookworm AS backend-builder
+WORKDIR /backend
+ENV SQLX_OFFLINE=true
+COPY backend/ ./
+RUN cargo build --release
+
+FROM debian:12-slim AS runtime
+WORKDIR /app
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends ca-certificates \
+    && rm -rf /var/lib/apt/lists/* \
+    && mkdir -p /app/storage
+COPY --from=backend-builder /backend/target/release/backend /app/backend
+COPY --from=frontend-builder /frontend/build /app/static
+ENV STORAGE_PATH=/app/storage
+
+EXPOSE 3000
+
+CMD ["/app/backend"]