[SAAS-018/020] feat: Add Sales and Commissions frontend modules
Sales Frontend (Sprint 2):
- Add services: leads, opportunities, activities, pipeline, dashboard APIs
- Add hooks: useSales with React Query integration
- Add pages: SalesPage, LeadsPage, LeadDetailPage, OpportunitiesPage, OpportunityDetailPage, ActivitiesPage
- Integrate routes in main router
Commissions Frontend (Sprint 4):
- Add services: schemes, entries, periods, assignments, dashboard APIs
- Add hooks: useCommissions with React Query integration
- Add pages: CommissionsPage, SchemesPage, EntriesPage, PeriodsPage, MyEarningsPage
- Integrate routes in main router
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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