GET /library search ignores album_name query parameter

[jakebromberg]

The `GET /library` search endpoint accepts `album_title` as a query parameter, but the OpenAPI spec (`CatalogSearchParams` in `api.yaml`) and the dj-site frontend both send `album_name`. This means album searches are silently ignored — the backend only matches against `artist_name`, so searching for an album title like "Confield" returns artist-name fuzzy matches (Scofield, Sinfield) instead of the album itself.

Root cause

`AlbumQueryParams` in `library.controller.ts` defines the field as `album_title`, while `CatalogSearchParams` in `api.yaml` defines it as `album_name`. The frontend sends `album_name`, which Express ignores since it doesn't match any declared query param.

Fix

Rename `album_title` to `album_name` in `AlbumQueryParams` and update all references in the controller, integration tests, and test utilities to match the spec.