6e5cf8fd

By: Michael Lynch <git@mtlynch.io>

Let owners edit captions and delete media

Adapt the owner-ID middleware from the slice-1 branch (resolveUser,
requireOwner, ReadUserByID, AuthService.UserID) so handlers can
authorize the site owner, then add owner-only actions to edit a media
item's caption, clear it, or delete the item entirely.

The caption edits use htmx with PUT to replace the caption in place and
DELETE to clear it, re-rendering the caption section partial. Deleting a
photo removes the item along with its comments and reactions in one
transaction and tells htmx to redirect to the home page.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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