feat: hide authorizer for rental orders, auto-set sale type

Rental orders no longer show the "Authorizer Required?" question or
the Authorizer field. The sale type is automatically set to 'Rentals'
when creating or confirming a rental order. Validation logic also
skips authorizer checks for rental sale type.

Made-with: Cursor

fusion_rental/wizard/__init__.py

@@ -1,2 +1,3 @@
 from . import manual_renewal_wizard
 from . import deposit_deduction_wizard
+from . import rental_return_wizard