refactor: 统一术语「成员」→「用户」，代码格式化

- 页面文案、注释、Toast 提示统一改为"用户"
- lefu 模块缩进格式化（空格→Tab）
- selectMemberDrawer 组件注释统一

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

miniprogram/components/selectMemberDrawer/selectMemberDrawer.wxml

@@ -1,4 +1,4 @@
-<!-- 选择已有成员抽屉 -->
+<!-- 选择已有用户抽屉 -->
 <block wx:if="{{ innerShow }}">
   <!-- 遮罩 -->
   <view class="drawer-mask {{ animVisible ? 'drawer-mask--visible' : '' }}" bind:tap="onTapMask"></view>
@@ -11,7 +11,7 @@
 
     <!-- 标题栏 -->
     <view class="drawer-header">
-      <text class="drawer-title">选择已有成员</text>
+      <text class="drawer-title">选择已有用户</text>
       <view class="drawer-close" bind:tap="onTapClose">
         <view class="drawer-close-icon"></view>
       </view>
@@ -20,7 +20,7 @@
     <!-- 分隔线 -->
     <view class="drawer-divider"></view>
 
-    <!-- 成员列表 -->
+    <!-- 用户列表 -->
     <block wx:if="{{ members.length }}">
       <scroll-view class="drawer-list" scroll-y>
         <block wx:for="{{ members }}" wx:key="id">
@@ -52,11 +52,11 @@
       </scroll-view>
     </block>
 
-    <!-- 无成员：占位 -->
+    <!-- 无用户：占位 -->
     <block wx:else>
       <view class="drawer-empty">
         <image class="drawer-empty-icon" src="/images/selectMemberDrawer/noData.png" mode="aspectFit"/>
-        <text class="drawer-empty-text">暂无可选成员</text>
+        <text class="drawer-empty-text">暂无可选用户</text>
       </view>
     </block>
   </view>