feat(beatmap,beatmapset): get beatmap & beatmapset information by id

app/router/__init__.py

@@ -1,6 +1,12 @@
 from __future__ import annotations
 
-from . import me  # pyright: ignore[reportUnusedImport]  # noqa: F401
+from . import (  # pyright: ignore[reportUnusedImport]  # noqa: F401
+    beatmap,
+    beatmapset,
+    me,
+)
 from .api_router import router as api_router
 from .auth import router as auth_router
 from .signalr import signalr_router as signalr_router
+
+__all__ = ["api_router", "auth_router", "signalr_router"]