lint（代码检查）

Lint and Type-Check

Run the full static-analysis suite on the project and fix any issues found.

1. uv run ruff check src — lint the code
2. uv run ruff format --check src — verify formatting
3. uv run pyrefly check src — static type analysis

Fix every issue reported (re-run until clean) and report a short summary of what changed when done. If a failure is not auto-fixable, explain what needs human judgement rather than silencing it.

Pyrefly + Django gotchas

Pyrefly has built-in Django support (via django-stubs), but a few things aren't covered yet. Recognize these before reaching for # type: ignore:

• Reverse relations (user.order_set, author.article_set) are not supported. This is a known pyrefly limitation, not a real bug. The right fix is to query the child model directly from its repository (OrderRepository().list_for_user(user_id)) — push the access down into the repo layer rather than suppressing it. Only if that's impossible, narrow it with # type: ignore[attr-defined] at a single call site.
• ManyRelatedManager is generic over [Parent, Model], not the concrete child. Don't rely on pyrefly to catch a mistyped M2M target — cover it with a test instead.
• Chained QuerySet methods beyond .all() are thinly typed. Keep chains inside the repository where the return type is an annotated list[SomeDTO]; don't let querysets leak out into services.

See pyrefly.org/en/docs/django for the current support matrix. Pyrefly's Django support is actively evolving — re-check when upgrading.