The `Product` namespace segment in the domain model namespace
`TTN\Tea\Domain\Model` currently serves no purpose and only adds
confusion. So let's simplify the extension structure accordingly.
(I intended to use this to demonstrate DDD contexts, but never
built enough models in the Tea extension for this to actually
make sense.)
Fixes#1008
This is a pre-patch for adding a CRUD plugin for tea records.
This property contains only the UID of the owner FE user, but not
a relation to a FE user model. This is because we neither have nor
need a FE user model for the purposes of the CRUD plugin.
