refactor: 将Data到ViewModel的转换由App转移至Server端

- 将逻辑转移到Server端后，简化前端逻辑

server/mappers/questionMapper.test.ts

@@ -0,0 +1,121 @@
+import { describe, expect, test } from 'vitest';
+import { toProductQuestionView, toQuestionListView } from './questionMapper';
+
+/**
+ * 单元测试: toProductQuestionView
+ */
+describe('toProductQuestionView', () => {
+  const baseData: Question = {
+    id: 1,
+    translations: [
+      { id: 1, title: 'Question Title', content: 'Question Answer' },
+    ],
+  };
+  test('convert raw data to ProductQuestionView correctly', () => {
+    const rawData: Question = {
+      ...baseData,
+    };
+
+    expect(toProductQuestionView(rawData)).toEqual({
+      id: 1,
+      title: 'Question Title',
+      content: 'Question Answer',
+    });
+  });
+
+  test('convert raw data with missing translations', () => {
+    const rawData: Question = {
+      ...baseData,
+      translations: [],
+    };
+
+    expect(toProductQuestionView(rawData)).toEqual({
+      id: 1,
+      title: '',
+      content: '',
+    });
+  });
+});
+
+/**
+ * 单元测试: toQuestionListView
+ */
+describe('toQuestionListView', () => {
+  const baseData: Question = {
+    id: 1,
+    translations: [
+      { id: 1, title: 'Question Title', content: 'Question Answer' },
+    ],
+    products: [
+      {
+        id: 1,
+        products_id: {
+          id: 1,
+          translations: [{ id: 1, name: 'Product Name' }],
+          product_type: {
+            id: 1,
+            translations: [{ id: 1, name: 'Type Name' }],
+          },
+        },
+      },
+    ],
+  };
+
+  test('convert raw data to QuestionListView correctly', () => {
+    const rawData: Question = {
+      ...baseData,
+    };
+
+    expect(toQuestionListView(rawData)).toEqual({
+      id: 1,
+      title: 'Question Title',
+      content: 'Question Answer',
+      products: [
+        {
+          id: 1,
+          name: 'Product Name',
+          type: {
+            id: 1,
+            name: 'Type Name',
+          },
+        },
+      ],
+    });
+  });
+
+  test('convert raw data with missing translations', () => {
+    const rawData: Question = {
+      ...baseData,
+      translations: [],
+      products: [
+        {
+          id: 1,
+          products_id: {
+            id: 1,
+            translations: [],
+            product_type: {
+              id: 1,
+              translations: [],
+            },
+          },
+        },
+      ],
+    };
+
+    expect(toQuestionListView(rawData)).toEqual({
+      id: 1,
+      title: '',
+      content: '',
+      products: [
+        {
+          id: 1,
+          name: '',
+          type: {
+            id: 1,
+            name: '',
+          },
+        },
+      ],
+    });
+  });
+});