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

packages/db/pyproject.toml

@@ -0,0 +1,23 @@
+[project]
+name = "ww-db"
+version = "0.0.0"
+requires-python = ">=3.12"
+dependencies = [
+  "sqlalchemy[asyncio]>=2.0",
+  "asyncpg>=0.29",
+  "psycopg[binary]>=3.2",
+  "alembic>=1.13",
+  "ww-shared",
+  "ww-config",
+]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.build.targets.wheel]
+packages = ["ww_db"]
+
+[tool.uv.sources]
+ww-shared = { workspace = true }
+ww-config = { workspace = true }