feat: #3612784 yoyaku_ticket_placement: show the venue (Where:) on placed tickets

Adds a Where row naming the venue to each placed ticket, next to the existing Place row, so a booker knows where to attend.

• The yoyaku_ticket_placement bridge now appends a venue TicketMetaRow (label "Where:", value the venue name from PlaceInterface::getVenue()) as well as the place row, via the same hook_yoyaku_ticket_units_alter seam.
• Venue is a placement concept (the yoyaku_venue entity and the resource venue field), so it stays in the bridge; the ticket module remains venue-agnostic and renders both rows generically (with ticket__row--venue / ticket__row--place classes).

Covered by TicketPlacementTest (placed tickets carry both venue and place; unplaced carry neither).