refactor: 国际化文本迁移至全局 locales/messages.js

将组件级 i18n 对象重构为统一由全局 locales/messages.js 管理，确保中英文语言切换时正确显示对应文本。

- 新增 utils/i18n.js 国际化工具函数
- 更新 store/$t.mixin.js 翻译混入逻辑
- 迁移 pkgService、pkgBooking、pkgAccount、pkgExplore、pages 等共 58 个组件的中英文文本至全局消息表

pkgService/contract_detail/contract_detail.vue

@@ -1,15 +1,15 @@
 <template>
   <view class="contract-detail-page tn-safe-area-inset-bottom">
     <tn-nav-bar :isBack="true" :bottomShadow="false" backgroundColor="transparent">
-      <view class="tn-text-bold tn-text-xl tn-color-black">{{ t('navTitle') }}</view>
+      <view class="tn-text-bold tn-text-xl tn-color-black">{{ $tr('合同详情') }}</view>
     </tn-nav-bar>
 
     <view class="page-main" :style="{ paddingTop: vuex_custom_bar_height + 'px' }">
       <view class="overview-panel">
         <view class="overview-header">
           <view>
-            <view class="overview-title">{{ t('overviewTitle') }}</view>
-            <view class="overview-subtitle">{{ t('contractNoLabel') }}{{ contractNo || t('notAvailable') }}</view>
+            <view class="overview-title">{{ $tr('合同影像') }}</view>
+            <view class="overview-subtitle">{{ $tr('合同编号：') }}{{ contractNo || $tr('未获取') }}</view>
           </view>
           <view class="overview-badge">
             <text class="tn-icon-read"></text>
@@ -19,26 +19,26 @@
         <view class="overview-tips">
           <view class="tip-chip">
             <text class="tn-icon-safe-fill"></text>
-            <text>{{ t('signedChip') }}</text>
+            <text>{{ $tr('已签合同') }}</text>
           </view>
           <view class="tip-chip">
             <text class="tn-icon-charts-ring"></text>
-            <text>{{ t('zoomSupportedChip') }}</text>
+            <text>{{ $tr('支持缩放') }}</text>
           </view>
           <view class="tip-chip" v-if="imageUrl">
             <text class="tn-icon-image-text-fill"></text>
-            <text>{{ t('imageModeChip') }}</text>
+            <text>{{ $tr('A4 影像模式') }}</text>
           </view>
           <view class="tip-chip" v-else-if="contractContent">
             <text class="tn-icon-text-new"></text>
-            <text>{{ t('textModeChip') }}</text>
+            <text>{{ $tr('正文预览模式') }}</text>
           </view>
         </view>
       </view>
 
       <view v-if="loading" class="empty-panel">
-        <view class="empty-title">{{ t('loadingTitle') }}</view>
-        <view class="empty-desc">{{ t('loadingDesc') }}</view>
+        <view class="empty-title">{{ $tr('合同加载中') }}</view>
+        <view class="empty-desc">{{ $tr('正在获取合同影像与正文，请稍候。') }}</view>
       </view>
 
       <view v-else-if="imageUrl || contractContent" class="preview-panel">
@@ -72,8 +72,8 @@
         <view class="empty-icon">
           <text class="tn-icon-folder"></text>
         </view>
-        <view class="empty-title">{{ t('emptyTitle') }}</view>
-        <view class="empty-desc">{{ t('emptyDesc') }}</view>
+        <view class="empty-title">{{ $tr('暂无合同内容') }}</view>
+        <view class="empty-desc">{{ $tr('页面未带入影像地址，且通过合同编号也未获取到可预览的合同内容。') }}</view>
       </view>
     </view>
   </view>
@@ -100,36 +100,6 @@ function normalizeRichTextContent(content = '') {
 }
 
 export default {
-  i18n: {
-    zh: {
-      navTitle: '合同详情',
-      overviewTitle: '合同影像',
-      contractNoLabel: '合同编号：',
-      notAvailable: '未获取',
-      signedChip: '已签合同',
-      zoomSupportedChip: '支持缩放',
-      imageModeChip: 'A4 影像模式',
-      textModeChip: '正文预览模式',
-      loadingTitle: '合同加载中',
-      loadingDesc: '正在获取合同影像与正文，请稍候。',
-      emptyTitle: '暂无合同内容',
-      emptyDesc: '页面未带入影像地址，且通过合同编号也未获取到可预览的合同内容。'
-    },
-    en: {
-      navTitle: 'Contract Detail',
-      overviewTitle: 'Contract Preview',
-      contractNoLabel: 'Contract No.: ',
-      notAvailable: 'N/A',
-      signedChip: 'Signed Contract',
-      zoomSupportedChip: 'Zoom Supported',
-      imageModeChip: 'A4 Image Mode',
-      textModeChip: 'Text Preview Mode',
-      loadingTitle: 'Loading contract',
-      loadingDesc: 'Fetching contract images and content. Please wait.',
-      emptyTitle: 'No contract content',
-      emptyDesc: 'No previewable contract content was provided by image URL or contract number.'
-    }
-  },
   data() {
     return {
       contractNo: '',
@@ -147,9 +117,6 @@ export default {
     this.fetchContractDetail()
   },
   methods: {
-    t(key, params) {
-      return this.$tm('pkgService.contract_detail.contract_detail', key, params)
-    },
     fetchContractDetail() {
       if (!this.contractNo || (this.imageUrl && this.contractContent)) {
         return Promise.resolve()