[Feature request] Allow ordering of custom fields

Description

Allow ordering of custom fields

Is your feature requet related to a problem? Please describe.
Currently, custom fields are displayed in the order they were created in the database.
This makes it impossible to rearrange them afterwards or enforce a meaningful sequence (e.g., Invoice Date, Supplier, Amount).
Adding numbers to the field labels (e.g., 1 - Invoice Date) does not change the order, as they are not sorted alphabetically either.

It would be great to have a way to define and customize the display order of custom fields.
For example:

Add a numeric "Display Order" attribute when creating or editing a custom field.

Or allow drag-and-drop reordering of custom fields in the admin interface.

Other

_No response_