Document orchestrator vehicle packing options

[roncodes]

Summary

• Documents VROOM capacity-only vehicle_packing and vehicle_fixed_cost options.
• Updates the Orchestrator run params definition so the API reference table includes the new request fields.
• Updates the VROOM capacity-only example to show minimize_vehicles packing and one vehicle taking multiple compatible orders.

Validation

• npm run postman:lint

Notes

• Postman CLI is not installed locally, so schema lint was skipped by the existing lint script.
• The unrelated local .github/workflows/notify-fleetbase-io.yml modification was left unstaged.