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

pyproject.toml

@@ -0,0 +1,51 @@
+[tool.uv.workspace]
+members = [
+  "apps/api",
+  "packages/shared",
+  "packages/config",
+  "packages/db",
+  "packages/llm_gateway",
+  "packages/core",
+  "packages/agents",
+]
+
+[dependency-groups]
+dev = [
+  "pytest>=8",
+  "pytest-asyncio>=0.24",
+  "ruff>=0.6",
+  "mypy>=1.11",
+  "httpx>=0.27",
+  "asgi-lifespan>=2.1",
+]
+
+[tool.ruff]
+line-length = 100
+target-version = "py312"
+src = ["apps", "packages"]
+
+[tool.ruff.lint]
+select = ["E", "F", "I", "UP", "B"]
+
+[tool.mypy]
+python_version = "3.12"
+mypy_path = [
+  "packages/shared",
+  "packages/config",
+  "packages/db",
+  "packages/llm_gateway",
+  "packages/core",
+  "packages/agents",
+  "apps/api",
+]
+namespace_packages = true
+strict = true
+ignore_missing_imports = true
+explicit_package_bases = true
+# 跨包聚合 mypy 时，多个无包 tests 目录的 conftest.py 会撞成同名模块 `conftest`。
+# conftest 仅含测试 fixtures；从聚合检查中排除（test_*.py / fakes_* 仍按唯一名受检）。
+exclude = ["(^|/)conftest\\.py$"]
+
+[tool.pytest.ini_options]
+asyncio_mode = "auto"
+testpaths = ["tests", "apps", "packages"]