RV/Boat Lots: waitlist size + more vehicle types

- Waitlist now captures a free-form Size (requested_size column) in place of
  the type field in the internal form/table.
- Lot type selector (add + bulk edit) expanded to RV, Boat, Travel Trailer,
  Fifth Wheel, Camper, Car, Truck, Trailer, Other.

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

supabase/migrations/20260608000000_add_waitlist_requested_size.sql

@@ -0,0 +1,2 @@
+-- RV/Boat waitlist: capture requested lot size (replaces "type" in the internal UI).
+alter table public.rv_boat_lot_waitlist add column if not exists requested_size text;