refactor: 重构产品相关Mapper

- 空值处理与类型控制：为相关关系型字段的数据处理添加空值处理与类型控制
- 调整目录结构：将文件目录按照实际查询划分为Product和ProductList两个文件

server/mappers/productListMapper.test.ts

@@ -0,0 +1,125 @@
+import { describe, expect, test } from 'vitest';
+import { toProductTypeView, toProductListView } from './productListMapper';
+
+/**
+ * 单元测试: toProductTypeView
+ */
+describe('toProductTypeView', () => {
+  const baseData: ProductType = {
+    id: 1,
+    translations: [
+      {
+        id: 1,
+        name: 'Type Name',
+      },
+    ],
+    sort: 5,
+  };
+
+  test('convert raw data to ProductTypeView correctly', () => {
+    const rawData: ProductType = { ...baseData };
+
+    expect(toProductTypeView(rawData)).toEqual({
+      id: '1',
+      name: 'Type Name',
+      sort: 5,
+    });
+  });
+
+  test('convert raw data with missing translations', () => {
+    const rawData: ProductType = {
+      ...baseData,
+      translations: [],
+    };
+
+    expect(toProductTypeView(rawData)).toEqual({
+      id: '1',
+      name: '',
+      sort: 5,
+    });
+  });
+
+  test('convert raw data with missing sort', () => {
+    const rawData: ProductType = {
+      ...baseData,
+      sort: undefined,
+    };
+
+    expect(toProductTypeView(rawData)).toEqual({
+      id: '1',
+      name: 'Type Name',
+      sort: 999,
+    });
+  });
+
+  test('convert null input to default value', () => {
+    const rawData: ProductType | string | null = null;
+
+    expect(toProductTypeView(rawData)).toEqual({
+      id: '-1',
+      name: '',
+      sort: 999,
+    });
+  });
+});
+
+/**
+ * 单元测试: toProductListView
+ */
+describe('toProductListView', () => {
+  test('convert raw data to ProductListView correctly', () => {
+    const rawData: Product = {
+      id: 1,
+      translations: [
+        { id: 10, name: 'Product Name', summary: 'Product Summary' },
+      ],
+      cover: {
+        id: 'cover-file-uuid-1234',
+      },
+      product_type: {
+        id: 1,
+        translations: [{ id: 20, name: 'Type Name' }],
+        sort: 1,
+      },
+    };
+
+    expect(toProductListView(rawData)).toEqual({
+      id: '1',
+      name: 'Product Name',
+      summary: 'Product Summary',
+      cover: 'cover-file-uuid-1234',
+      product_type: {
+        id: '1',
+        name: 'Type Name',
+        sort: 1,
+      },
+    });
+  });
+
+  test('convert raw data with missing translations', () => {
+    const rawData: Product = {
+      id: 1,
+      translations: [],
+      cover: {
+        id: 'cover-file-uuid-1234',
+      },
+      product_type: {
+        id: 20,
+        translations: [],
+        sort: 1,
+      },
+    };
+
+    expect(toProductListView(rawData)).toEqual({
+      id: '1',
+      name: '',
+      summary: '',
+      cover: 'cover-file-uuid-1234',
+      product_type: {
+        id: '20',
+        name: '',
+        sort: 1,
+      },
+    });
+  });
+});