feat: Phase 0 — monorepo 骨架 + 全表迁移 + FastAPI/Next 骨架 + CI

- uv(workspace) + pnpm monorepo；docker-compose(pg+api+web)
- SQLAlchemy 16 MVP 表 + Alembic 初版迁移(无漂移，users stub)
- FastAPI 骨架：统一错误信封(带 request_id) + structlog + /jobs/:id + OpenAPI
- Next.js 骨架：纸感主题 token + OpenAPI→TS 客户端代码生成(gen:api)
- CI(ruff/mypy/pytest + pg service + alembic 漂移校验)
- 四份设计规格(PRODUCT/UX/ARCHITECTURE/DEV_PLAN) + CLAUDE.md

apps/web/Dockerfile

@@ -0,0 +1,15 @@
+FROM node:22-slim AS build
+RUN corepack enable
+WORKDIR /app
+COPY package.json pnpm-lock.yaml* ./
+RUN pnpm install --frozen-lockfile || pnpm install
+COPY . .
+RUN pnpm build
+
+FROM node:22-slim AS run
+WORKDIR /app
+COPY --from=build /app/.next/standalone ./
+COPY --from=build /app/.next/static ./.next/static
+COPY --from=build /app/public ./public
+EXPOSE 3000
+CMD ["node", "server.js"]