Image uploads never worked (validateFile's null success was read as failure,
generatePath got three arguments, the returned URL was treated as a flag);
expiry was never saved; an Arabic-only announcement could not be stored
(title and content are NOT NULL); the list linked to an unpublish route that
did not exist.

Now: Arabic title and text are what is required, expiry is entered in Cairo
time, images go to org-media (JPEG/PNG/WebP up to 5 MB, removed from storage
when replaced, removed or the announcement is deleted). Publishing sets
published_at and sends one org_announcement notification to every active
member, in chunks of 500, with org_id and announcement_id in data; it is
logged in org_activity_log. Republishing after an unpublish never notifies
twice. "Publish now" on create needs the same permission as publish.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>