fix: 修正表单默认值和反馈分类选项

将销售表单的默认里程值从1200改为100
将反馈页面的默认分类选项从null改为'feature'

 <!--
  * @Date: 2022-09-19 14:11:06
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-07-14 15:46:39
+ * @LastEditTime: 2025-07-15 13:14:50
  * @FilePath: /jgdl/src/pages/feedBack/index.vue
  * @Description: 意见反馈页面
 -->
@@ -138,7 +138,7 @@ const categories = ref([
 ])
 
 // 表单数据
-const selectedCategory = ref(null)
+const selectedCategory = ref('feature')
 const feedbackText = ref('')
 const contactInfo = ref('')
 const uploadedImages = ref([])

@@ -374,7 +374,7 @@ const formData = reactive({
     brandModel: '', // 品牌型号组合字段，用于表单验证
     manufacture_year: '',
     new_level: '',
-    total_mileage_km: '1200',
+    total_mileage_km: '100',
     range_km: '60',
     max_speed_kmh: '25',
     battery_capacity_ah: '20',