Client search page wired to the live API

[erikhfj]

Apollo Client + the search view hitting the real backend.

• ApolloProvider, InMemoryCache with a searchAlbums merge policy for fetchMore
• search bar (Enter + button), debounce 300 ms
• result list with review count and community rating
• loading / error / empty states

Acceptance: typing a word and pressing Enter shows matching albums from the database.

[erikhfj]

Before you open the PR: implement from the requirement, not by copying from archive/scaffold-prototype. The prototype is a reference you can check against when you get stuck. It is not a source to paste from.

The PR description must say what was done and what was tested. That is what we read when we review.