refactor: cleanup and remove thin wrappers

Remove install ports and *Impl wrappers that were only adding indirection inside
the app module.

App-side helpers now call the existing app services directly for
network checks, storage checks, parental control auth, and update tracking.

Keep only the installation ports that still define a real boundary with the data
module.

Simplify app event dispatch by providing the dispatcher directly from
Hilt instead of using a dedicated implementation class.

Update the related unit
tests to match the simplified wiring.