Follow-up to efd5c4a. The plan invented {"accepted": True, ...} for
the new 202 responses, but every other 2xx endpoint in the Flask app
returns {"ok": True, ...} — including cameras.py:108 which is direct
prior art for a 202 with the same convention. The shared JS helper
at static/js/settings.js:54 does 'if (resp.ok && result.ok)' and was
falling into the error branch on our success responses, showing a
bogus "Save failed" toast after every arm/disarm click.
Keep the 202 status. Swap the body key from 'accepted' to 'ok'.
No JS change needed.
9f203d8ce5