Give the analytics overview a per-parent, per-year balance series

Each parent projection now carries one entry per calendar year from
birth to the fourth birthday: vacation earned, carried in, planned,
left, carried out and expiring under Semesterlagen's 20-day floor and
5-year carry-over, plus parental-leave days used and left at year end
with the age-4 clamp applied in the birthday year. The overview sums
them into per-year totals. Frontend types, mapper and fixtures follow.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XBRLomdLK9jF7wU7a8AA6H

backend/app/dependencies.py

@@ -354,8 +354,11 @@ def get_analytics_service(
     child_repo: ChildRepositoryDep,
     pd_repo: PersonalDataRepositoryDep,
     workspace_repo: WorkspaceRepositoryDep,
+    vacation_repo: VacationDaysRepositoryDep,
 ) -> AnalyticsService:
-    return AnalyticsService(leave_repo, planned_repo, child_repo, pd_repo, workspace_repo)
+    return AnalyticsService(
+        leave_repo, planned_repo, child_repo, pd_repo, workspace_repo, vacation_repo
+    )
 
 
 AnalyticsServiceDep = Annotated[AnalyticsService, Depends(get_analytics_service)]