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

.github/workflows/ci.yml

@@ -0,0 +1,64 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  backend:
+    runs-on: ubuntu-latest
+    services:
+      postgres:
+        image: postgres:16-alpine
+        env:
+          POSTGRES_USER: writer
+          POSTGRES_PASSWORD: writer
+          POSTGRES_DB: writer
+        ports: ["5432:5432"]
+        options: >-
+          --health-cmd "pg_isready -U writer"
+          --health-interval 5s --health-timeout 3s --health-retries 10
+    env:
+      DATABASE_URL: postgresql+asyncpg://writer:writer@localhost:5432/writer
+      DATABASE_URL_SYNC: postgresql+psycopg://writer:writer@localhost:5432/writer
+    steps:
+      - uses: actions/checkout@v4
+      - uses: astral-sh/setup-uv@v5
+      - run: uv sync
+      - name: ruff
+        run: uv run ruff check .
+      - name: mypy
+        run: uv run mypy packages apps
+      - name: alembic upgrade + drift check
+        run: |
+          uv run alembic upgrade head
+          uv run alembic check
+      - name: pytest
+        run: uv run pytest -q
+
+  frontend:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: astral-sh/setup-uv@v5
+      - run: uv sync
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+      - run: corepack enable
+      - name: install
+        working-directory: apps/web
+        run: pnpm install --frozen-lockfile
+      - name: gen api types
+        working-directory: apps/web
+        run: pnpm gen:api
+      - name: lint
+        working-directory: apps/web
+        run: pnpm lint
+      - name: typecheck
+        working-directory: apps/web
+        run: pnpm typecheck
+      - name: test
+        working-directory: apps/web
+        run: pnpm test