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/db/connection.py

@@ -25,7 +25,8 @@ _FULL_SCHEMA = """
 CREATE TABLE IF NOT EXISTS workspace (
     id TEXT PRIMARY KEY,
     name TEXT NOT NULL,
-    created_at TIMESTAMP NOT NULL
+    created_at TIMESTAMP NOT NULL,
+    take_pl_on_red_days BOOLEAN NOT NULL DEFAULT 0
 );
 
 CREATE TABLE IF NOT EXISTS personal_data (