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

pkgExplore/vr_preview/vr_preview.vue

@@ -12,23 +12,23 @@
 
     <view class="vr-stage">
       <image v-if="poster" :src="poster" mode="aspectFill" class="vr-poster"></image>
-      <view v-else class="vr-empty tn-flex tn-flex-col-center tn-flex-row-center">{{ t('emptyPreview') }}</view>
+      <view v-else class="vr-empty tn-flex tn-flex-col-center tn-flex-row-center">{{ $tr('暂无VR预览画面') }}</view>
       <view class="vr-mask"></view>
 
-      <view class="vr-mode-chip">{{ t('modeChip') }}</view>
+      <view class="vr-mode-chip">{{ $tr('VR预览模式') }}</view>
 
       <view class="vr-center-indicator" @click="openPosterPreview">
         <view class="indicator-ring"></view>
         <view class="indicator-core">
           <text class="tn-icon-vr indicator-icon"></text>
         </view>
-        <text class="indicator-text">{{ poster ? t('viewFullscreen') : t('waitingAsset') }}</text>
+        <text class="indicator-text">{{ poster ? $tr('查看全屏预览') : $tr('等待素材接入') }}</text>
       </view>
 
       <view class="vr-bottom-bar tn-safe-area-inset-bottom">
         <view class="vr-title-area">
           <view class="vr-title">{{ resolvedPageTitle }}</view>
-          <view class="vr-subtitle">{{ poster ? t('posterSubtitle') : t('placeholderSubtitle') }}</view>
+          <view class="vr-subtitle">{{ poster ? $tr('当前展示 VR 预览海报，可点击查看大图。') : $tr('当前房型已保留 VR 入口，后续可继续接入更完整的沉浸式资源。') }}</view>
         </view>
         
         <view class="vr-action-circle" @click="openPosterPreview">
@@ -41,28 +41,6 @@
 
 <script>
 export default {
-  i18n: {
-    zh: {
-      defaultTitle: 'VR看房',
-      emptyPreview: '暂无VR预览画面',
-      modeChip: 'VR预览模式',
-      viewFullscreen: '查看全屏预览',
-      waitingAsset: '等待素材接入',
-      posterSubtitle: '当前展示 VR 预览海报，可点击查看大图。',
-      placeholderSubtitle: '当前房型已保留 VR 入口，后续可继续接入更完整的沉浸式资源。',
-      noAsset: '暂无VR预览素材'
-    },
-    en: {
-      defaultTitle: 'VR Viewing',
-      emptyPreview: 'No VR preview available',
-      modeChip: 'VR Preview',
-      viewFullscreen: 'View Fullscreen',
-      waitingAsset: 'Waiting for assets',
-      posterSubtitle: 'The current VR preview poster is displayed. Tap to view the full image.',
-      placeholderSubtitle: 'This room type keeps its VR entry reserved for richer immersive assets later.',
-      noAsset: 'No VR preview asset available'
-    }
-  },
   data() {
     return {
       pageTitleZh: '',
@@ -74,9 +52,9 @@ export default {
   computed: {
     resolvedPageTitle() {
       if (this.$getLanguage() === 'en') {
-        return this.pageTitleEn || this.pageTitleZh || this.rawPageTitle || this.t('defaultTitle')
+        return this.pageTitleEn || this.pageTitleZh || this.rawPageTitle || this.$tr('VR看房')
       }
-      return this.pageTitleZh || this.pageTitleEn || this.rawPageTitle || this.t('defaultTitle')
+      return this.pageTitleZh || this.pageTitleEn || this.rawPageTitle || this.$tr('VR看房')
     },
     navBarBackStyle() {
       return {
@@ -112,13 +90,10 @@ export default {
     }
   },
   methods: {
-    t(key, params) {
-      return this.$tm('pkgExplore.vr_preview.vr_preview', key, params)
-    },
     openPosterPreview() {
       if (!this.poster) {
         uni.showToast({
-          title: this.t('noAsset'),
+          title: this.$tr('暂无VR预览素材'),
           icon: 'none'
         })
         return