Document FleetOps public resource endpoints

[roncodes]

Summary

Documents the new FleetOps public REST API resources in the Fleetbase API Postman collection.

Changes

• Adds documentation folders for equipment, parts, work orders, devices, sensors, and fuel transactions.
• Adds CRUD requests, action requests, params, query params, resource object descriptions, and example responses.
• Uses the public fuel-transactions endpoint naming for fuel transaction documentation.

Validation

• Ran the Postman collection validation script.
• Ran cached diff whitespace checks.