Adds complete audit trail for all stock movements:
- InventoryTransaction model with transaction types (reserve, fulfill,
release, adjust, set, import, return)
- Alembic migration for inventory_transactions table
- Transaction logging in order_inventory_service for all order operations
- Captures quantity snapshots, order references, and timestamps
Each inventory operation now creates a transaction record for
accountability and debugging.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>