Stage 7 - Integration:
- Create notification types migration for procurement
- Fix signals to use pre_save for status tracking
- Add broadcast_request_update function for WebSocket events
- Add procurement_update handler in UserConsumer
- Add 6 integration tests for signals and notifications
- Update README with integration details
All 72 tests passing (66 base + 6 integration).
Игорь Надеин
d04b5e38c2