fix(diet): 修复 preferences.wxml 编译错误 - :key 移除带字符串参数的方法调用，避免 data-event-opts 解析失败

cfc-frontend/pages/diet/preferences.vue

@@ -27,7 +27,7 @@
         <view class="card">
           <text class="card-title">过敏原 *</text>
           <view class="chip-group">
-            <view class="chip" v-for="(item, i) in presetAllergies" :key="getChipKey('a', i)"
+            <view class="chip" v-for="(item, i) in presetAllergies" :key="i"
               :class="{ 'chip-active': allergies.indexOf(item) >= 0 }"
               @tap="toggleChip('allergies', item)">
               <text>{{ item }}</text>
@@ -46,7 +46,7 @@
         <view class="card">
           <text class="card-title">绝对忌口 *</text>
           <view class="chip-group">
-            <view class="chip" v-for="(item, i) in presetAvoid" :key="getChipKey('v', i)"
+            <view class="chip" v-for="(item, i) in presetAvoid" :key="i"
               :class="{ 'chip-active': absoluteAvoid.indexOf(item) >= 0 }"
               @tap="toggleChip('absoluteAvoid', item)">
               <text>{{ item }}</text>
@@ -65,7 +65,7 @@
         <view class="card">
           <text class="card-title">宗教饮食</text>
           <view class="chip-group">
-            <view class="chip" v-for="(opt, i) in religiousOptions" :key="getChipKey('r', i)"
+            <view class="chip" v-for="(opt, i) in religiousOptions" :key="i"
               :class="{ 'chip-active': religiousDiet === opt.value }"
               @tap="religiousDiet = opt.value">
               <text>{{ opt.label }}</text>
@@ -100,7 +100,7 @@
         <view class="card">
           <text class="card-title">口味偏好</text>
           <view class="chip-group">
-            <view class="chip" v-for="(item, i) in presetFlavor" :key="getChipKey('f', i)"
+            <view class="chip" v-for="(item, i) in presetFlavor" :key="i"
               :class="{ 'chip-active': flavorPref.indexOf(item) >= 0 }"
               @tap="toggleChip('flavorPref', item)">
               <text>{{ item }}</text>
@@ -120,7 +120,7 @@
         <view class="card">
           <text class="card-title">菜系偏好</text>
           <view class="chip-group">
-            <view class="chip" v-for="(item, i) in presetCuisine" :key="getChipKey('c', i)"
+            <view class="chip" v-for="(item, i) in presetCuisine" :key="i"
               :class="{ 'chip-active': cuisinePref.indexOf(item) >= 0 }"
               @tap="toggleChip('cuisinePref', item)">
               <text>{{ item }}</text>
@@ -140,7 +140,7 @@
         <view class="card">
           <text class="card-title">烹饪方式</text>
           <view class="chip-group">
-            <view class="chip" v-for="(item, i) in presetCooking" :key="getChipKey('k', i)"
+            <view class="chip" v-for="(item, i) in presetCooking" :key="i"
               :class="{ 'chip-active': cookingMethods.indexOf(item) >= 0 }"
               @tap="toggleChip('cookingMethods', item)">
               <text>{{ item }}</text>
@@ -171,7 +171,7 @@
         <view class="card">
           <text class="card-title">必吃食物</text>
           <view class="chip-group">
-            <view class="chip" v-for="(item, i) in presetMustEat" :key="getChipKey('m', i)"
+            <view class="chip" v-for="(item, i) in presetMustEat" :key="i"
               :class="{ 'chip-active': mustEat.indexOf(item) >= 0 }"
               @tap="toggleChip('mustEat', item)">
               <text>{{ item }}</text>
@@ -190,7 +190,7 @@
         <view class="card">
           <text class="card-title">健康目标</text>
           <view class="chip-group">
-            <view class="chip" v-for="(item, i) in presetGoals" :key="getChipKey('g', i)"
+            <view class="chip" v-for="(item, i) in presetGoals" :key="i"
               :class="{ 'chip-active': healthGoals.indexOf(item) >= 0 }"
               @tap="toggleChip('healthGoals', item)">
               <text>{{ item }}</text>
@@ -304,9 +304,6 @@ export default {
       })
     },
     // ——— chip 选中态（模板用内联 indexOf，方法供 toggle 用） ———
-    getChipKey: function(prefix, index) {
-      return prefix + '-' + index
-    },
     toggleChip: function(field, value) {
       var idx = this[field].indexOf(value)
       if (idx >= 0) {