Rework balances around per-parent days left and deduce the partner from FK

Manual entry now takes one parent's sjukpenningnivå, lägstanivå and
dubbeldagar left (plus optional reserved days) and derives the rest in
build_snapshot, shared with the scraper. The scraper also reads the
family panel and exposes a partner deduction; with two parents it is
saved as a 'deduced' snapshot (migration 002). Parent count is the single
source of entitlement: one member gets 480 days and 96 savable at age 4,
two get 240 and 48 each. Workspaces are capped at two parents.

Also lands the in-flight squash of migrations 002–011 into the initial
schema and the removal of planning_mode.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

backend/tests/conftest.py

@@ -353,6 +353,7 @@ async def planning_service(
     parental_leave_repo: SQLiteParentalLeaveRepository,
     vacation_repo: SQLiteVacationDaysRepository,
     planning_engine_service: PlanningEngineService,
+    leave_wish_repo: SQLiteLeaveWishRepository,
 ) -> PlanningService:
     return PlanningService(
         planned_leave_repo,
@@ -360,6 +361,7 @@ async def planning_service(
         parental_leave_repo,
         vacation_repo,
         planning_engine_service,
+        leave_wish_repo=leave_wish_repo,
     )
 
 
@@ -385,6 +387,7 @@ async def planning_service_with_uow(
     parental_leave_repo: SQLiteParentalLeaveRepository,
     vacation_repo: SQLiteVacationDaysRepository,
     planning_engine_service: PlanningEngineService,
+    leave_wish_repo: SQLiteLeaveWishRepository,
     sqlite_uow: SQLiteUnitOfWork,
 ) -> PlanningService:
     return PlanningService(
@@ -393,6 +396,7 @@ async def planning_service_with_uow(
         parental_leave_repo,
         vacation_repo,
         planning_engine_service,
+        leave_wish_repo=leave_wish_repo,
         uow=sqlite_uow,
     )
 
@@ -417,7 +421,6 @@ async def tips_service(
     personal_data_repo: SQLitePersonalDataRepository,
     vacation_repo: SQLiteVacationDaysRepository,
     leave_wish_repo: SQLiteLeaveWishRepository,
-    workspace_repo: SQLiteWorkspaceRepository,
     tip_dismissal_repo: SQLiteTipDismissalRepository,
 ) -> TipsService:
     return TipsService(
@@ -427,6 +430,5 @@ async def tips_service(
         personal_data_repo,
         vacation_repo,
         leave_wish_repo,
-        workspace_repo,
         tip_dismissal_repo,
     )