[OWL] Dashboard charts (Recharts CDN) + API layer + portal user management
Dashboard Charts:
- 4 interactive charts via Recharts CDN (no build step):
* Freight & Commission trend (line chart, 6 months)
* Load status distribution (pie chart)
* Top routes by freight (bar chart)
* Top shippers by freight (horizontal bar chart)
- Govt-app color theme (#000080 navy, #138808 green, #FF9933 saffron)
- INR formatting on tooltips and axes
- Async Recharts loading with retry
API Layer (/api):
- Full REST CRUD: loads, shippers, vehicles, payments
- Dashboard stats endpoint
- Pagination, filtering, sorting
- Role-based access control on writes
- Soft delete support
Portal User Management (/portal-users):
- Admin UI to create shipper/driver portal accounts
- Link to existing shippers/drivers
- Enable/disable, reset password, delete
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