Replace department-portal allocation summary with the shared allocation-utilization service

Background

PR #654 adds an Allocation card to the Department Portal. The card currently uses app/logic/allocation_utilization.py as a temporary local calculation layer while the official shared allocation-utilization service is being developed.

Work needed

• Replace the calculations in app/logic/allocation_utilization.py with calls to the official shared service.
• Preserve the values required by the Department Portal: total allocated positions, usage by primary/secondary hour bucket, total used positions, and break hours used.
• Confirm which Labor Status Forms should count as used.
• Add or update integration tests.

Acceptance criteria

• The Department Portal does not contain its own allocation-utilization query logic.
• allocation_utilization.py delegates to the official shared service.
• The Allocation card displays correct values for the open term.
• Tests cover the shared-service integration.

Related work

• Parent feature: PR #654
• Temporary implementation: app/logic/allocation_utilization.py

Comienza con app/logic/allocation_utilization.py y la tarjeta Department Portal Allocation añadida por PR #654. Identifica el servicio oficial compartido de allocation-utilization y confirma qué Labor Status Forms cuentan como utilizadas. Actualiza las pruebas de integración para cubrir los valores del servicio compartido para el término abierto, incluidas las posiciones asignadas, los bloques de horas, las posiciones utilizadas y las horas de descanso.