- fix driver_locations schema mismatch: use `relation` instead of `driver` per live PB schema
- remove invalid `ready_for_collection` filter that caused silent 400 errors
- add order_item_attachments support for driver pickup photos with proper error handling:
* replace legacy collection_photo field with new collection for multiple per-item files
* upload photos after updating item status to avoid stranding assigned items
* show warning toast if upload fails instead of success confirmation
* update toast messages to reflect photo upload status
- add pre-build schema check script to catch invalid PB field references pre-deploy
- add corresponding npm scripts and prebuild hook for the schema check
- add e2e test scripts for collection and upload flows
- update type definitions and pocketbase SDK helpers for new schema and functionality
