Fix genre filter being dropped when searching albums

In AlbumModel.getPaginatedAlbums (backend/src/api/models/Album.ts), the query starts with a .where() for the genre filter and then calls .where() again to add the search filter. Drizzle's .where() replaces the previous condition instead of combining them, so when both a genre filter and a search term are set, the genre filter is silently thrown away and the search runs against all albums.

The let q: any cast is what allows the second .where() call to compile at all, so that should go too.

• Build both conditions up front and pass them through a single .where() with and()
• Remove the any cast so Drizzle's types can catch this in future