Andrey Smakotin d2f15b5126 Add stock reservation auto-update system
- Add management command to recalculate quantity_reserved for all Stock records
- Add signals to automatically update Stock when Reservation changes
- Implement post_save signal for Reservation creation/updates
- Implement post_delete signal for Reservation deletion
- Both signals call Stock.refresh_from_batches() to recalculate quantities

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Co-Authored-By: Claude <noreply@anthropic.com>
2025-11-08 11:07:35 +03:00
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