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

pages/index/component/SelectRoomHero.vue

@@ -57,12 +57,12 @@
         <!-- 底部操作区 -->
         <view class="hero-bottom tn-flex tn-flex-direction-column tn-flex-col-center">
           <view class="hero-actions tn-flex tn-flex-row-between" :class="{ 'hero-actions--en': language === 'en' }">
-            <view class="action-btn outline-btn" :class="{ 'action-btn--en': language === 'en' }" @click="$emit('consult')">{{ t('apartmentDetail') }}</view>
-            <view class="action-btn primary-btn" :class="{ 'action-btn--en': language === 'en' }" @click="$emit('submit')">{{ t('bookViewing') }}</view>
+            <view class="action-btn outline-btn" :class="{ 'action-btn--en': language === 'en' }" @click="$emit('consult')">{{ $tr('公寓详情') }}</view>
+            <view class="action-btn primary-btn" :class="{ 'action-btn--en': language === 'en' }" @click="$emit('submit')">{{ $tr('预约看房') }}</view>
           </view>
 
           <view class="scroll-hint tn-flex tn-flex-direction-column tn-flex-col-center" @click="$emit('collapse')">
-            <text class="scroll-hint__text">{{ t('learnMore') }}</text>
+            <text class="scroll-hint__text">{{ $tr('了解更多') }}</text>
             <view class="scroll-hint__double-icon">
               <text class="tn-icon-down scroll-hint__icon"></text>
               <text class="tn-icon-down scroll-hint__icon scroll-hint__icon--second"></text>
@@ -136,9 +136,6 @@ export default {
     displayTabSubtitle(item = {}) {
       return this.getBannerDisplayText(item, 'tab')
     },
-    t(key) {
-      return this.$tm('pages.index.component.SelectRoomTab', key)
-    },
     formatTabTitle(title) {
       const normalizedTitle = String(title || '')
       return normalizedTitle