modularize src

+ merge main.py and manage.py
+ move start logic to swingmusic/__main__.py
+ add a run.py on the project root

swingmusic/serializers/artist.py

@@ -0,0 +1,42 @@
+from dataclasses import asdict
+
+from swingmusic.models.artist import Artist
+
+
+def serialize_for_card(artist: Artist, include: set[str] = set()):
+    try:
+        artist_dict = asdict(artist)
+    except TypeError:
+        return {}
+
+    props_to_remove = {
+        "is_favorite",
+        "trackcount",
+        "duration",
+        "albumcount",
+        "playcount",
+        "playduration",
+        "playcount",
+        "lastplayed",
+        "id",
+        "genres",
+        "genrehashes",
+        "extra",
+        "created_date",
+        "date",
+        "fav_userids",
+        "_score",
+    }
+
+    if include:
+        props_to_remove = props_to_remove - include
+
+    for key in props_to_remove:
+        artist_dict.pop(key, None)
+
+    artist_dict["type"] = "artist"
+    return artist_dict
+
+
+def serialize_for_cards(artists: list[Artist]):
+    return [serialize_for_card(a) for a in artists]