This update standardizes internal VoIP data field names so they match the naming used elsewhere in Odoo. It supports an underlying platform cleanup by removing reliance on an older renaming mechanism, with no intended change to daily VoIP behavior.

The discuss team maintaining the `Store` code is getting rid of the
`rename` feature. So, this pr updates the code of the VoIP JS models
to use the same naming convention as the python code.

Task-4801651

This update tidies the internal setup files for Odoo Subscriptions by improving file organization, clarifying menu structure, and removing duplicate definitions. It should make future maintenance easier without changing day-to-day subscription workflows for users.