feat(userManagement): 成员列表增加已删除状态展示

- delFlag=1 的成员显示「已删除」红色状态
- 已删除成员卡片半透明

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

miniprogram/pages/userManagement/userManagement.wxml

@@ -37,7 +37,7 @@
             <view class="scrollViewContent">
                 <!-- 本人 -->
                 <block wx:if="{{ self }}">
-                <view class="member-card">
+                <view class="member-card {{ self.delFlag === 1 ? 'member-card--deleted' : '' }}">
                     <view class="member-top">
                         <view class="member-avatar">
 							<image src="{{ self.gender === '女' ? '/images/woman.png' : '/images/man.png' }}" mode="aspectFit" />
@@ -65,7 +65,7 @@
                 <block wx:for="{{ groups }}" wx:key="title" wx:for-item="group">
                     <view class="group-title">{{ group.title }}</view>
                     <block wx:for="{{ group.members }}" wx:key="id" wx:for-item="member">
-                        <view class="member-card">
+                        <view class="member-card {{ member.delFlag === 1 ? 'member-card--deleted' : '' }}">
                             <view class="member-top">
                                 <view class="member-avatar {{ member.gender === '女' ? 'member-avatar--female' : 'member-avatar--male' }}"><image src="{{ member.gender === '女' ? '/images/woman.png' : '/images/man.png' }}" mode="aspectFit" /></view>
                                 <view class="member-info">