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/master/products/validations/product.validation.go

@@ -32,5 +32,5 @@ type Query struct {
 	Page              int    `query:"page" validate:"omitempty,number,min=1"`
 	Limit             int    `query:"limit" validate:"omitempty,number,min=1"`
 	Search            string `query:"search" validate:"omitempty,max=50"`
-	ProductCategoryID int   `query:"product_category_id" validate:"omitempty,number,min=1"`
+	ProductCategoryID int    `query:"product_category_id" validate:"omitempty,number,min=1"`
 }