refactor(clinical-scheduler): drop orphaned store cluster (Phase 2)

- Delete schedule.ts + schedule-{actions,cache,state}.ts: a 549-line
  state-management refactor landed in Sep 2025 ("Phase 4 - Frontend
  state management refactoring") was never wired in. `useScheduleStore`
  has zero importers anywhere in the codebase; RotationScheduleView and
  ClinicianScheduleView talk to services directly.
- Delete stores/permissions/index.ts: shadowed by sibling
  stores/permissions.ts (TypeScript resolves the .ts file before the
  directory index), making it structurally unreachable.
- Drop 5 redundant named exports from use-schedule-normalization.ts
  (normalizeSemesterWeeks, filterExcludedRotations, getAssignedRotationNames,
  normalizeClinicianSchedule, normalizeRotationSchedule). All five are
  only accessed via the useScheduleNormalization() composable; the
  module-level duplicates had no importers. normalizeWeek and
  normalizeScheduleSemesters stay exported — tests import them directly.

Author: rlorenzo

VueApp/src/ClinicalScheduler/composables/use-schedule-normalization.ts

@@ -106,14 +106,4 @@ function useScheduleNormalization() {
     }
 }
 
-// Export all functions together
-export {
-    normalizeWeek,
-    normalizeSemesterWeeks,
-    normalizeScheduleSemesters,
-    filterExcludedRotations,
-    getAssignedRotationNames,
-    normalizeClinicianSchedule,
-    normalizeRotationSchedule,
-    useScheduleNormalization,
-}
+export { normalizeWeek, normalizeScheduleSemesters, useScheduleNormalization }