Persist skip_on_away on quest definitions

Add a skip_on_away flag to quest_definitions (migration 8, additive
column defaulting to 1 so existing rows keep today's behaviour). The
admin create/edit routes accept it as an optional boolean (create
defaults true, an omitted edit field keeps the stored value) and the
definition payload returns it. Materialisation generates instances on
absent dates when the flag is false.

Task: ded75ab8-0219-4d52-aefa-82c09e0b5e6b

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_api_admin_questdef_list.py

@@ -137,6 +137,7 @@ async def test_admin_lists_active_and_inactive_definitions_with_full_shape(
                 "description": "Put everything back where it belongs.",
                 "icon": "toy-box",
                 "is_active": True,
+                "skip_on_away": True,
                 "rule": {
                     "rule_type": "weekly",
                     "interval": 1,
@@ -160,6 +161,7 @@ async def test_admin_lists_active_and_inactive_definitions_with_full_shape(
                 "description": None,
                 "icon": None,
                 "is_active": False,
+                "skip_on_away": True,
                 "rule": {
                     "rule_type": "daily",
                     "interval": 1,
@@ -209,6 +211,53 @@ async def test_list_items_match_the_create_response_shape(
     assert response.json() == {"definitions": [created.json()]}
 
 
+async def test_skip_on_away_round_trips_true_and_false_through_list(
+    admin_client: object,
+) -> None:
+    """skip_on_away posted true, false, or omitted lists back as stored."""
+    child = await admin_client.post(
+        "/api/v1/admin/children",
+        json={"display_name": "Cleo"},
+        headers=_admin_headers(),
+    )
+    child_id = child.json()["id"]
+
+    async def create(title: str, extra: dict[str, object]) -> dict:
+        response = await admin_client.post(
+            LIST_PATH,
+            json={
+                "title": title,
+                "rule": {
+                    "rule_type": "daily",
+                    "interval": 1,
+                    "start_date": "2026-03-01",
+                },
+                "assignee_child_ids": [child_id],
+                "windows": ["morning"],
+                **extra,
+            },
+            headers=_admin_headers(),
+        )
+        assert response.status_code == 201
+        return response.json()
+
+    skipping = await create("Skip when away", {"skip_on_away": True})
+    keeping = await create("Keep when away", {"skip_on_away": False})
+    defaulted = await create("Default", {})
+    assert skipping["skip_on_away"] is True
+    assert keeping["skip_on_away"] is False
+    assert defaulted["skip_on_away"] is True
+
+    response = await admin_client.get(LIST_PATH, headers=_admin_headers())
+
+    assert response.status_code == 200
+    listed = {item["id"]: item for item in response.json()["definitions"]}
+    assert listed[skipping["id"]]["skip_on_away"] is True
+    assert listed[keeping["id"]]["skip_on_away"] is False
+    assert listed[defaulted["id"]]["skip_on_away"] is True
+    assert response.json() == {"definitions": [skipping, keeping, defaulted]}
+
+
 async def test_empty_household_lists_no_definitions(
     admin_client: object,
 ) -> None: