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

docker-compose.yml

@@ -0,0 +1,43 @@
+services:
+  pg:
+    image: postgres:16-alpine
+    environment:
+      POSTGRES_USER: writer
+      POSTGRES_PASSWORD: writer
+      POSTGRES_DB: writer
+    ports:
+      - "5432:5432"
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U writer"]
+      interval: 5s
+      timeout: 3s
+      retries: 10
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+
+  api:
+    build:
+      context: .
+      dockerfile: apps/api/Dockerfile
+    environment:
+      DATABASE_URL: postgresql+asyncpg://writer:writer@pg:5432/writer
+      DATABASE_URL_SYNC: postgresql+psycopg://writer:writer@pg:5432/writer
+      APP_ENV: dev
+    ports:
+      - "8000:8000"
+    depends_on:
+      pg:
+        condition: service_healthy
+
+  web:
+    build:
+      context: ./apps/web
+    environment:
+      NEXT_PUBLIC_API_BASE: http://localhost:8000
+    ports:
+      - "3000:3000"
+    depends_on:
+      - api
+
+volumes:
+  pgdata: