Two real bugs surfaced in testing:
1. Original file not deleted on replace: delete_replaced_track checked os.path.exists
on the RAW stored DB path (a Docker/media-server view), so it removed the row but
orphaned the file. Now takes a resolve_fn (wired to resolve_library_file_path in
the worker) and unlinks the RESOLVED real path.
2. No year / wrong album context: build_identification_from_hint set is_single=True,
routing re-identify through _match_tracks' singles fast-path — which never fetches
the chosen album, so the re-import got a bare stub (no release_date, total_tracks=1).
Added force_album_match so the matcher FETCHES the chosen release even for a lone
staged file → the track inherits the real album's year, in-album track number, and
art. Holds for single-type releases too (they have a year as well).
Normal single-import behavior unchanged (force_album_match absent → same path).
112 auto-import + rematch tests green.
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