Link planned days to their wish, fix the age-4 cap, drop the planning goal

Three changes that together unblock treating a calendar period as one
editable object.

Migration 008 adds `planned_leave_day.wish_id` (nullable, ON DELETE SET NULL)
so a persisted day knows which `leave_wish` produced it, `is_pinned` to mark a
day the user hand-edited, and `leave_wish.target_days` so a period drawn on a
calendar need not be a whole number of weeks. Apply-time identity still keys on
day_type/is_dubbeldag only, so a wish_id-only difference is a metadata update
rather than a collision.

The age-4 savable ceiling was applying the per-child figure of 96 to each
parent's pool, modelling a two-parent family as able to save 192 days past the
child's fourth birthday. `resolve_age4_savable_cap` is now the single place
that decides 48 (couple with two parents) versus 96 (everyone else), and both
AnalyticsService and the allocator read it.

Migration 009 drops `workspace.planning_goal` and `leave_wish.goal_override`.
The allocator's tier-3 policy collapses to one rule; `salary_type` still
branches, since that reflects what a vacation day actually costs a parent
rather than a user preference.

backend/app/routers/analytics.py

@@ -10,6 +10,7 @@ from app.dependencies import (
     ParentalLeaveRepositoryDep,
     PersonalDataRepositoryDep,
     PlannedLeaveRepositoryDep,
+    WorkspaceRepositoryDep,
 )
 from app.models.analytics import Age4ProjectionResponse, WorkspaceOverviewResponse
 from app.services.analytics_service import AnalyticsService
@@ -23,8 +24,9 @@ def _make_service(
     planned_repo: PlannedLeaveRepositoryDep,
     child_repo: ChildRepositoryDep,
     pd_repo: PersonalDataRepositoryDep,
+    workspace_repo: WorkspaceRepositoryDep,
 ) -> AnalyticsService:
-    return AnalyticsService(leave_repo, planned_repo, child_repo, pd_repo)
+    return AnalyticsService(leave_repo, planned_repo, child_repo, pd_repo, workspace_repo)
 
 
 @router.get("/{workspace_id}/overview", response_model=WorkspaceOverviewResponse)
@@ -35,9 +37,10 @@ async def get_overview(
     planned_repo: PlannedLeaveRepositoryDep,
     child_repo: ChildRepositoryDep,
     pd_repo: PersonalDataRepositoryDep,
+    workspace_repo: WorkspaceRepositoryDep,
     _current_user: CurrentUserDep,
 ) -> WorkspaceOverviewResponse:
-    service = _make_service(leave_repo, planned_repo, child_repo, pd_repo)
+    service = _make_service(leave_repo, planned_repo, child_repo, pd_repo, workspace_repo)
     try:
         overview = await service.get_overview(workspace_id, child_id)
     except NotFoundError as exc:
@@ -53,9 +56,10 @@ async def get_projection(
     planned_repo: PlannedLeaveRepositoryDep,
     child_repo: ChildRepositoryDep,
     pd_repo: PersonalDataRepositoryDep,
+    workspace_repo: WorkspaceRepositoryDep,
     _current_user: CurrentUserDep,
 ) -> WorkspaceOverviewResponse:
-    service = _make_service(leave_repo, planned_repo, child_repo, pd_repo)
+    service = _make_service(leave_repo, planned_repo, child_repo, pd_repo, workspace_repo)
     try:
         overview = await service.get_overview(workspace_id, child_id)
     except NotFoundError as exc:
@@ -73,9 +77,10 @@ async def get_age4_projection(
     planned_repo: PlannedLeaveRepositoryDep,
     child_repo: ChildRepositoryDep,
     pd_repo: PersonalDataRepositoryDep,
+    workspace_repo: WorkspaceRepositoryDep,
     _current_user: CurrentUserDep,
 ) -> Age4ProjectionResponse:
-    service = _make_service(leave_repo, planned_repo, child_repo, pd_repo)
+    service = _make_service(leave_repo, planned_repo, child_repo, pd_repo, workspace_repo)
     try:
         proj = await service.get_days_left_at_age_4(personal_data_uuid, child_id)
     except NotFoundError as exc:

backend/app/routers/leave_wishes.py

@@ -1,8 +1,8 @@
 """HTTP routes for leave wishes.
 
 Routers stay thin: validate via Pydantic, call the service, map domain errors
-to HTTP. Business logic (recurrence/parent_mode/goal_override validation,
-month-day range checks) lives in LeaveWishService. See PLANNING_ENGINE_SPEC.md §4.
+to HTTP. Business logic (recurrence/parent_mode validation, month-day range
+checks) lives in LeaveWishService. See PLANNING_ENGINE_SPEC.md §4.
 """
 
 from uuid import UUID
@@ -35,13 +35,13 @@ async def create_leave_wish(
             window_end_month=payload.window_end_month,
             window_end_day=payload.window_end_day,
             target_weeks=payload.target_weeks,
+            target_days=payload.target_days,
             recurrence=payload.recurrence,
             first_year=payload.first_year,
             last_year=payload.last_year,
             priority=payload.priority,
             parent_mode=payload.parent_mode,
             parent_personal_data_uuid=payload.parent_personal_data_uuid,
-            goal_override=payload.goal_override,
             window_mode=payload.window_mode,
         )
     except ValidationError as exc:
@@ -77,13 +77,13 @@ async def update_leave_wish(
             window_end_month=payload.window_end_month,
             window_end_day=payload.window_end_day,
             target_weeks=payload.target_weeks,
+            target_days=payload.target_days,
             recurrence=payload.recurrence,
             first_year=payload.first_year,
             last_year=payload.last_year,
             priority=payload.priority,
             parent_mode=payload.parent_mode,
             parent_personal_data_uuid=payload.parent_personal_data_uuid,
-            goal_override=payload.goal_override,
             window_mode=payload.window_mode,
             _clear_child_id="child_id" in fields_set and payload.child_id is None,
             _clear_last_year="last_year" in fields_set and payload.last_year is None,
@@ -91,10 +91,10 @@ async def update_leave_wish(
                 "parent_personal_data_uuid" in fields_set
                 and payload.parent_personal_data_uuid is None
             ),
-            _clear_goal_override=("goal_override" in fields_set and payload.goal_override is None),
             _clear_name_message_key=(
                 "name_message_key" in fields_set and payload.name_message_key is None
             ),
+            _clear_target_days="target_days" in fields_set and payload.target_days is None,
         )
     except ValidationError as exc:
         raise HTTPException(status.HTTP_422_UNPROCESSABLE_ENTITY, str(exc)) from exc

backend/app/routers/workspace.py

@@ -81,9 +81,7 @@ async def update_workspace(
     _current_user: CurrentUserDep,
 ) -> WorkspaceResponse:
     try:
-        ws = await service.update_workspace(
-            workspace_id, payload.name, payload.planning_goal, payload.planning_mode
-        )
+        ws = await service.update_workspace(workspace_id, payload.name, payload.planning_mode)
     except (NotFoundError, ValidationError) as exc:
         code = (
             status.HTTP_404_NOT_FOUND