Adds three new endpoints for viewing stock movement history:
- GET /inventory/transactions - paginated list with filters
- GET /inventory/transactions/product/{id} - product-specific history
- GET /inventory/transactions/order/{id} - order-specific history
Creates InventoryTransactionService to encapsulate query logic
following architecture patterns. Includes response schemas with
product details for rich UI display.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>