Add product retrieval by department categories and typecasting fixes

- Added methods in `department_categories_o`, `departments_o`, and `categories_o` to retrieve products associated with department categories.
- Updated `productsRoute` and `superuserDepartmentRoute` to fetch department-specific products.
- Fixed typecasting in product price assignments for improved data consistency.

services/nginx/app/objects/departments_o.php

@@ -380,4 +380,29 @@ class departments_o extends db
         $this->getObjectProperties();
         return $this;
     }
+
+    /**
+     * @throws Exception
+     * @return products_o[] An array of all products in the department's categories
+     */
+    public function getAllProductInDepartmentCategories(): array
+    {
+        self::requireSelected();
+        // Get all the categories associated
+        $department_categories = (new department_categories_o())->getDepartmentCategoryObjects($this->id);
+        $categories = [];
+        /** @var products_o[] $products */
+        $products = [];
+        foreach ( $department_categories as $department_category ) {
+            $categories[] = $department_category->getCategory();
+        }
+        foreach ( $categories as $category ) {
+            $cat_products = $category->getProducts();
+            foreach ($cat_products as $cat_product) {
+                $products[] = $cat_product;
+            }
+        }
+        // Remove duplicate products
+        return array_unique($products, SORT_REGULAR);
+    }
 }