add method and route to search across tracks, albums and artists.

+ break models into separate files
+ same for the utils and setup

app/utils/remove_duplicates.py

@@ -0,0 +1,23 @@
+from collections import defaultdict
+from operator import attrgetter
+
+from app.models import Track
+
+
+def remove_duplicates(tracks: list[Track]) -> list[Track]:
+    """
+    Remove duplicates from a list of Track objects based on the trackhash attribute.
+    Retains objects with the highest bitrate.
+    """
+    hash_to_tracks = defaultdict(list)
+
+    for track in tracks:
+        hash_to_tracks[track.trackhash].append(track)
+
+    tracks = []
+
+    for track_group in hash_to_tracks.values():
+        max_bitrate_track = max(track_group, key=attrgetter("bitrate"))
+        tracks.append(max_bitrate_track)
+
+    return tracks