feat(vacation): 상세 — 승인은 취소처리, 미승인(작성중/제출/반려)은 삭제(hard)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/modules/vacation/router.py

@@ -800,3 +800,28 @@ async def cancel(
     except PermissionError as exc:
         raise HTTPException(status_code=403, detail=str(exc))
     return RedirectResponse(url=f"/vacation/{request_id}", status_code=303)
+
+
+@router.post("/{request_id}/delete")
+async def delete(
+    request: Request,
+    request_id: str,
+    user: dict[str, Any] = Depends(_require_user),
+) -> RedirectResponse:
+    """완전 삭제 — 승인 전(작성중/제출/반려)만. 달력으로 복귀."""
+    from app.store import is_admin  # noqa: WPS433
+
+    store = _store(request)
+    if store is None:
+        raise HTTPException(status_code=503, detail="vacation_db 미설정")
+    try:
+        store.hard_delete(
+            request_id=request_id, user_email=user["email"], is_admin=is_admin(user)
+        )
+    except KeyError:
+        raise HTTPException(status_code=404, detail="휴가 신청을 찾을 수 없습니다.")
+    except PermissionError as exc:
+        raise HTTPException(status_code=403, detail=str(exc))
+    except ValueError as exc:
+        raise HTTPException(status_code=409, detail=str(exc))
+    return RedirectResponse(url="/vacation/", status_code=303)