Move backend files to root level for cleaner GitHub display

- Move all backend files from swingmusic/ to root level
- Backend files now display directly on GitHub repository page
- Keep client applications as submodules (swingmusic-android, swingmusic-desktop, swingmusic-webclient)
- Update README to reflect new structure (no cd swingmusic needed)
- Cleaner, more professional GitHub repository layout

Files moved to root:
- src/ (main source code)
- pyproject.toml, requirements.txt, run.py
- swingmusic.spec, uv.lock, version.txt
- services/

Result: GitHub shows backend files directly while maintaining organized structure

src/swingmusic/api/home/__init__.py

@@ -0,0 +1,38 @@
+from flask_openapi3 import Tag
+from flask_openapi3 import APIBlueprint
+from pydantic import BaseModel, Field
+
+from swingmusic.api.apischemas import GenericLimitSchema
+from swingmusic.lib.home.recentlyadded import get_recently_added_items
+from swingmusic.lib.home.get_recently_played import get_recently_played
+from swingmusic.store.homepage import HomepageStore
+
+bp_tag = Tag(name="Home", description="Homepage items")
+api = APIBlueprint("home", __name__, url_prefix="/nothome", abp_tags=[bp_tag])
+
+
+@api.get("/recents/added")
+def get_recently_added(query: GenericLimitSchema):
+    """
+    Get recently added
+    """
+    return {"items": get_recently_added_items(query.limit)}
+
+
+@api.get("/recents/played")
+def get_recent_plays(query: GenericLimitSchema):
+    """
+    Get recently played
+    """
+    return {"items": get_recently_played(query.limit)}
+
+
+class HomepageItem(BaseModel):
+    limit: int = Field(
+        default=9, description="The max number of items per group to return"
+    )
+
+
+@api.get("/")
+def homepage_items(query: HomepageItem):
+    return HomepageStore.get_homepage_items(limit=query.limit)