Add a reference field for bicycle_rental

[heragnar]

Description

Automated bicycle-sharing systems often assign a reference number to each rack. This number serves to identify the specific station, facilitating the submission of repair reports or requests for maintenance and refilling. While some stations are identified by names, they also have a reference number for additional clarity.

Incorporating an option to select this reference number from the drop-down menu, rather than manually inputting the 'ref' tag, would significantly enhance user convenience.

Screenshots