Add a Map tab that reuses the reservation-map pin picker. Staff drop/label
pins per lot and optionally link a directory unit (pin.linked_amenity_id =
unit id). Config persists per association in rv_boat_lot_maps.
GoogleMapPicker generalized with optional linkLabel + allowLinkAnyStatus
(defaults preserve the amenity reservation-map behavior).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
