feat: 用户行为信誉分系统

- User 新增 credit_score 字段（0-200，默认100）
- 信誉分影响检测阈值系数：高分降低敏感度，低分提高敏感度
- 发布成功+1分，被拦截-2分；申诉通过+10分，驳回-5分
- 新增手动调整和批量重算信誉分接口
- admin-users 页面显示信誉分进度条，支持编辑调整

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

miniprogram/pages/admin-users/index.wxml

@@ -27,6 +27,13 @@
     <view class="list-item" wx:for="{{users}}" wx:key="id">
       <view class="item-title">{{item.nickname}}（{{item.username}}）</view>
       <view class="item-sub">{{item.company || '未填写公司'}} · {{item.title || '未填写岗位'}} · {{item.is_admin ? '管理员' : '普通用户'}}</view>
+      <view class="row">
+        <text class="label">信誉分</text>
+        <view class="credit-score-bar">
+          <view class="credit-fill" style="width: {{(item.credit_score || 100) / 2}}%;"></view>
+          <text class="credit-value">{{item.credit_score || 100}}</text>
+        </view>
+      </view>
 
       <view wx:if="{{editUserId === item.id}}">
         <input class="input" placeholder="昵称" value="{{editForm.nickname}}" data-field="nickname" bindinput="onEditInput" />
@@ -34,6 +41,7 @@
         <input class="input" placeholder="岗位" value="{{editForm.title}}" data-field="title" bindinput="onEditInput" />
         <input class="input" placeholder="手机号" value="{{editForm.phone}}" data-field="phone" bindinput="onEditInput" />
         <input class="input" placeholder="新密码（可选）" password value="{{editForm.password}}" data-field="password" bindinput="onEditInput" />
+        <input class="input" placeholder="信誉分（0-200）" type="number" value="{{editForm.credit_score}}" data-field="credit_score" bindinput="onEditInput" />
 
         <view class="row">
           <text class="label">管理员权限</text>