fix(BE-48): improve adjustment history filtering and fix pointer conversion

- Add search parameter to adjustment history API
- Fix JOIN query logic to avoid duplicate JOINs
- Use EXISTS subquery for cleaner product/warehouse filtering
- Fix pointer conversion issue in slice iteration
- Improve query performance and code readability

internal/modules/inventory/adjustments/controllers/adjustment.controller.go

@@ -48,7 +48,6 @@ func (u *AdjustmentController) AdjustmentHistory(c *fiber.Ctx) error {
 	query := &validation.Query{
 		Page:            c.QueryInt("page", 1),
 		Limit:           c.QueryInt("limit", 10),
-		Search:          c.Query("search", ""),
 		ProductID:       c.QueryInt("product_id", 0),
 		WarehouseID:     c.QueryInt("warehouse_id", 0),
 		TransactionType: c.Query("transaction_type", ""),