refactor: 统一项目内国际化key的命名空间格式

本次提交对全项目的国际化调用进行了规范化重构：
1. 为中文/英文语言包新增了avatar和gender的别名映射，兼容旧有headImg/sex写法
2. 修正了lang.js中的注释路径错误
3. 将所有页面和组件内的$lang调用从短路径改为带业务模块前缀的完整命名空间路径，例如将$lang('title')改为$lang('article.list.title')
4. 优化了i18n-lazy.js的注释说明，补充了正确的key命名格式示例
5. 统一了分销、订单、会员等模块的国际化key层级，确保所有语言调用路径一致

pages_tool/ai-chat/components/ai-chat-avatar-selector.vue

@@ -3,7 +3,7 @@
     <view class="avatar-selector-mask" @click="close"></view>
     <view class="avatar-selector-panel">
       <view class="avatar-selector-header">
-        <text>{{ $lang('avatarSelectorTitle') }}</text>
+        <text>{{ $lang('ai-chat.index.avatarSelectorTitle') }}</text>
         <button class="close-btn" @click="close">
           <text class="iconfont icon-close"></text>
         </button>
@@ -15,10 +15,10 @@
         <view class="avatar-selector-actions">
           <button class="avatar-select-action" @click="chooseAvatarFromAlbum">
             <text class="iconfont icon-album"></text>
-            <text>{{ $lang('chooseFromAlbum') }}</text>
+            <text>{{ $lang('ai-chat.index.chooseFromAlbum') }}</text>
           </button>
           <button class="avatar-select-action cancel" @click="close">
-            <text>{{ $lang('cancel') }}</text>
+            <text>{{ $lang('ai-chat.index.cancel') }}</text>
           </button>
         </view>
       </view>
@@ -80,7 +80,7 @@ export default {
           reader.readAsDataURL(file)
           this.$emit('avatar-change', tempFilePath)
           this.close()
-          uni.showToast({ title: this.$lang('avatarChangeSuccess'), icon: 'success', duration: 1500 })
+          uni.showToast({ title: this.$lang('ai-chat.index.avatarChangeSuccess'), icon: 'success', duration: 1500 })
         } else {
           this.close()
         }
@@ -99,11 +99,11 @@ export default {
           uni.setStorageSync('user_avatar', tempFilePath)
           this.$emit('avatar-change', tempFilePath)
           this.close()
-          uni.showToast({ title: this.$lang('avatarChangeSuccess'), icon: 'success', duration: 1500 })
+          uni.showToast({ title: this.$lang('ai-chat.index.avatarChangeSuccess'), icon: 'success', duration: 1500 })
         },
         fail: (error) => {
           if (error.errMsg && error.errMsg.includes('deny')) {
-            uni.showToast({ title: this.$lang('enableAlbumPermission'), icon: 'none', duration: 2000 })
+            uni.showToast({ title: this.$lang('ai-chat.index.enableAlbumPermission'), icon: 'none', duration: 2000 })
           }
           this.close()
         }