Let a household choose to be paid for the red days

Asking for a full week off never spent anything on the Saturday, the
Sunday or a holiday, and a test now says so outright rather than leaving
it to be rediscovered. Those days are free because vacation cannot be
taken on a day that is not a working day.

Parental benefit is a payment rather than a schedule, though, so it can
be drawn on a red day to turn an unpaid day off into a paid one — at the
cost of a day the family would otherwise keep. That is now a workspace
setting, off by default, and it never reaches for a vacation day. With it
off the planner behaves exactly as before.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ei7gCZzdd751uZtPzb1Pep

backend/app/services/workspace_service.py

@@ -82,10 +82,14 @@ class WorkspaceService:
         self,
         workspace_id: UUID,
         name: str | None = None,
+        *,
+        take_pl_on_red_days: bool | None = None,
     ) -> Workspace:
         ws = await self.get_workspace(workspace_id)
         if name is not None:
             ws.name = name
+        if take_pl_on_red_days is not None:
+            ws.take_pl_on_red_days = take_pl_on_red_days
         return await self._ws.update(workspace_id, ws)
 
     async def list_members(self, workspace_id: UUID) -> list[PersonalData]: