modularize src

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

swingmusic/lib/recipes/because.py

@@ -0,0 +1,37 @@
+from pprint import pprint
+from swingmusic.db.userdata import UserTable
+from swingmusic.lib.recipes import HomepageRoutine
+from swingmusic.lib.recipes.artistmixes import ArtistMixes
+from swingmusic.models.mix import Mix
+from swingmusic.plugins.mixes import MixesPlugin
+from swingmusic.store.homepage import HomepageStore
+
+
+class BecauseYouListened(HomepageRoutine):
+    store_keys = ["because_you_listened_to_artist", "artists_you_might_like"]
+
+    @property
+    def is_valid(self):
+        return MixesPlugin().enabled
+
+    def run(self):
+        users = UserTable.get_all()
+
+        for user in users:
+            entry: dict[str, Mix] = HomepageStore.entries.get(
+                ArtistMixes.store_key
+            ).items.get(user.id)  # type: ignore
+
+            if not entry:
+                continue
+
+            because_you_listened_to_artist, artists_you_might_like = (
+                MixesPlugin().get_because_items(list(entry.values()))
+            )
+
+            HomepageStore.entries[self.store_keys[0]].items[
+                user.id
+            ] = because_you_listened_to_artist
+            HomepageStore.entries[self.store_keys[1]].items[
+                user.id
+            ] = artists_you_might_like