refactor: 将项目内硬编码文本替换为多语言调用

统一替换所有页面和组件中的硬编码字符串为 $lang 多语言方法调用，提升项目国际化适配能力

pages_tool/seal/structure.vue

@@ -3,13 +3,13 @@
     <view class="picker-container">
       <view v-for="(item, idx) in pickerList" :key="item.id" class="single-picker">
         <picker mode="selector" :value="item.value" :range="item.range" range-key="name" @change="bindPickerChange($event, idx, item)">
-          <view class="picker">当前选择：{{item.range[item.value].name || '请选择'}}</view>
+          <view class="picker">{{ $lang('seal.currentSelection') }}：{{item.range[item.value].name || $lang('seal.pleaseSelect')}}</view>
         </picker>
       </view>
     </view>
     <block v-if="answerName">
       <view style="font-size:32rpx;color:#ff0000;text-align:center;">
-        <view style="color:#ff0000;">选型结果：</view>{{answerName}}
+        <view style="color:#ff0000;">{{ $lang('seal.selectionResult') }}：</view>{{answerName}}
       </view>
     </block>
     <block v-if="files_url">
@@ -20,7 +20,7 @@
               <image style="width:50rpx;height:50rpx;" :src="g0" mode="widthFix" show-menu-by-longpress></image>
             </view>
           </view>
-          <view class="file_title">结果文件</view>
+          <view class="file_title">{{ $lang('seal.resultFile') }}</view>
         </view>
       </view>
     </block>