ycb_django_pr13809

what a new run launched now would send

Add --skip-checks option to the runserver command.
Description
	
Rationale:
It would be consistent with other management commands performing system checks
It would help people like me who would rather have checks enabled exclusively in CI/CD than wait 15-20 seconds for each project reload during development
Related StackOverflow question:
​https://stackoverflow.com/questions/41438593/skip-system-checks-on-django-server-in-debug-mode-in-pycharm/41725866

Work only inside this repository checkout. Make the code change the task
describes, keeping the diff focused — no drive-by refactors.

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Stay on this snapshot checkout (`task/ycb_django_pr13809`). Never checkout, pull, or rebase onto `main`. That branch is a README-only orphan.
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