Make every PaymentRequest changelist column sortable ascending/descending
(computed amount/user/jalali columns get an `ordering` so they sort by the
underlying DB field; only the "check success again" action button stays
unsortable). Add a default `-created_at` ordering and surface `updated_at`
as its own sortable column. The created_at/updated_at DateTimeRangeFilters
are retained and compose with sorting.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
