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

app/router/beatmapset.py

@@ -0,0 +1,26 @@
+from __future__ import annotations
+
+from app.database import (
+    Beatmapset,
+    BeatmapsetResp,
+    User as DBUser,
+)
+from app.dependencies.database import get_db
+from app.dependencies.user import get_current_user
+
+from .api_router import router
+
+from fastapi import Depends, HTTPException
+from sqlmodel import Session, select
+
+
+@router.get("/beatmapsets/{sid}", tags=["beatmapset"], response_model=BeatmapsetResp)
+async def get_beatmapset(
+    sid: int,
+    current_user: DBUser = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    beatmapset = db.exec(select(Beatmapset).where(Beatmapset.id == sid)).first()
+    if not beatmapset:
+        raise HTTPException(status_code=404, detail="Beatmapset not found")
+    return BeatmapsetResp.from_db(beatmapset)