feat(m0): 后端骨架 + Web/安卓前端骨架 + 设计文档

- backend: FastAPI 应用工厂、统一错误信封、JWT、短信登录、工作区/成员/邀请、幂等中间件
- alembic 0001: workspace/member/invitation/audit_log/app_user + RLS 策略 + 双角色 GRANT
- tests: 认证/工作区/租户隔离/幂等 四组用例（尚未在本机执行）
- web: React18+Vite 骨架（登录、工作区、邀请落地页）
- android: Compose 骨架（登录、工作区列表）
- 2.Design: PRODUCT-PLAN / ROADMAP-M0-M1 / NAMING / DEVELOPMENT

backend/pyproject.toml

@@ -0,0 +1,22 @@
+[tool.ruff]
+line-length = 100
+target-version = "py310"
+extend-exclude = ["alembic/versions"]
+
+[tool.ruff.lint]
+select = ["E", "F", "I", "UP", "B", "ASYNC", "S", "C4", "SIM"]
+ignore = ["S101"]  # 测试里允许 assert
+
+[tool.ruff.lint.per-file-ignores]
+"tests/*" = ["S105", "S106"]      # 测试里的假令牌/假口令
+"alembic/env.py" = ["E402"]
+
+[tool.ruff.lint.isort]
+known-first-party = ["app"]
+
+[tool.pytest.ini_options]
+asyncio_mode = "auto"
+asyncio_default_fixture_loop_scope = "function"
+testpaths = ["tests"]
+addopts = "-q --strict-markers"
+filterwarnings = ["ignore::DeprecationWarning"]