fix: 亮灯表权限控制 — 客户经理只看自己

get_light_board 新增 user_id/role 参数:
- director/leader: 看全部经理 + 未分配客户
- manager: 只看自己, 不显示未分配客户
- API 层从 current_user 提取身份信息透传

backend/app/api/dashboard.py

@@ -60,6 +60,6 @@ async def light_board(
     current_user: dict = Depends(get_current_user),
     db: AsyncSession = Depends(get_db),
 ):
-    """Get customer visit coverage matrix (light board). Director/leader only."""
+    """Get customer visit coverage matrix. Managers see only themselves."""
     ref = date.fromisoformat(reference_date) if reference_date else None
-    return await get_light_board(db, ref)
+    return await get_light_board(db, ref, uuid.UUID(current_user["user_id"]), current_user["role"])