feat: 运营报告生成功能

- 后端新增 /admin/stats/report 接口，生成14天运营数据报告
- 报告内容：垃圾信息变化趋势、高频风险词Top10、误判率趋势
- 前端运营看板增加"生成报告"按钮，展示完整报告
- 支持复制报告文本到剪贴板

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

miniprogram/pages/admin-dashboard/index.js

@@ -7,7 +7,9 @@ Page({
     kpis: [],
     bars: [],
     sourceDist: [],
-    topKeywords: []
+    topKeywords: [],
+    report: null,
+    reportLoading: false
   },
 
   formatPercent(value, digits = 2) {
@@ -67,5 +69,74 @@ Page({
       this.setData({ loading: false })
       if (fromPullDown) wx.stopPullDownRefresh()
     }
+  },
+
+  async generateReport() {
+    this.setData({ reportLoading: true })
+    try {
+      const report = await request({ url: '/admin/stats/report' })
+
+      // 处理趋势数据，计算进度条宽度
+      const spamTrend = (report.spam_trend || []).map((item) => {
+        const maxBlocked = Math.max(...(report.spam_trend || []).map((r) => r.blocked || 0), 1)
+        return {
+          ...item,
+          blocked_percent: `${Math.max(4, Math.round((item.blocked || 0) / maxBlocked * 100))}%`
+        }
+      })
+
+      const misjudgeTrend = (report.misjudge_trend || []).map((item) => ({
+        ...item,
+        rate_percent: `${Math.round((item.misjudge_rate || 0) * 100)}%`
+      }))
+
+      this.setData({
+        report: {
+          ...report,
+          spam_trend: spamTrend,
+          misjudge_trend: misjudgeTrend
+        }
+      })
+
+      wx.showToast({ title: '报告已生成', icon: 'success' })
+    } finally {
+      this.setData({ reportLoading: false })
+    }
+  },
+
+  closeReport() {
+    this.setData({ report: null })
+  },
+
+  copyReportText() {
+    const report = this.data.report
+    if (!report) return
+
+    const summary = report.summary || {}
+    const lines = [
+      `【垃圾信息运营报告】`,
+      `报告周期：${report.period}`,
+      `生成时间：${(report.report_date || '').replace('T', ' ').slice(0, 19)}`,
+      '',
+      `【汇总统计】`,
+      `总发布量：${summary.total_posts || 0} 条`,
+      `拦截量：${summary.total_blocked || 0} 条`,
+      `正常发布：${summary.total_published || 0} 条`,
+      `拦截率：${this.formatPercent(summary.blocked_ratio, 2)}`,
+      `复核总数：${summary.total_reviews || 0} 次`,
+      `误判放行：${summary.total_approved || 0} 次`,
+      `平均误判率：${summary.avg_misjudge_rate_text || '0%'}`,
+      '',
+      `【高频风险词 Top10】`,
+      (report.top_keywords || []).slice(0, 10).map((k) => `${k.token}(${k.count}次)`).join('、'),
+      '',
+      `【近7日趋势】`,
+      (report.spam_trend || []).slice(-7).map((t) => `${t.label}: 拦截${t.blocked}条，发布${t.published}条`).join('\n')
+    ]
+
+    wx.setClipboardData({
+      data: lines.join('\n'),
+      success: () => wx.showToast({ title: '报告已复制', icon: 'success' })
+    })
   }
 })

miniprogram/pages/admin-dashboard/index.wxml

@@ -54,4 +54,83 @@
       <text class="tag" wx:for="{{topKeywords}}" wx:key="token">{{item.token}} × {{item.count}}</text>
     </view>
   </view>
+
+  <!-- 生成报告按钮 -->
+  <view class="card fade-up fade-up-delay-3">
+    <button class="btn btn-accent" loading="{{reportLoading}}" bindtap="generateReport">生成运营报告</button>
+  </view>
+
+  <!-- 报告展示区域 -->
+  <view class="report-modal" wx:if="{{report}}">
+    <view class="report-header">
+      <view class="report-title">垃圾信息运营报告</view>
+      <view class="report-period">{{report.period}}</view>
+    </view>
+
+    <view class="report-close" bindtap="closeReport">×</view>
+
+    <view class="report-section">
+      <view class="report-section-title">汇总统计</view>
+      <view class="grid-3">
+        <view class="report-kpi">
+          <view class="report-kpi-value">{{report.summary.total_posts}}</view>
+          <view class="report-kpi-label">总发布量</view>
+        </view>
+        <view class="report-kpi">
+          <view class="report-kpi-value">{{report.summary.total_blocked}}</view>
+          <view class="report-kpi-label">拦截量</view>
+        </view>
+        <view class="report-kpi">
+          <view class="report-kpi-value">{{report.summary.total_published}}</view>
+          <view class="report-kpi-label">正常发布</view>
+        </view>
+      </view>
+      <view class="row">
+        <text class="label">拦截率</text>
+        <text class="value">{{report.summary.blocked_ratio * 100}}%</text>
+      </view>
+      <view class="row">
+        <text class="label">平均误判率</text>
+        <text class="value">{{report.summary.avg_misjudge_rate_text}}</text>
+      </view>
+    </view>
+
+    <view class="report-section">
+      <view class="report-section-title">垃圾信息数量变化（近14天）</view>
+      <view class="report-trend-item" wx:for="{{report.spam_trend}}" wx:key="date">
+        <view class="row">
+          <text class="label">{{item.label}}</text>
+          <text class="value">拦截 {{item.blocked}} / 发布 {{item.published}}</text>
+        </view>
+        <view class="progress-track">
+          <view class="progress-fill" style="width: {{item.blocked_percent}};"></view>
+        </view>
+      </view>
+    </view>
+
+    <view class="report-section">
+      <view class="report-section-title">高频风险词 Top10</view>
+      <view class="chip-group">
+        <text class="tag tag-danger" wx:for="{{report.topKeywords}}" wx:for-item="kw" wx:if="{{index < 10}}" wx:key="token">{{kw.token}} × {{kw.count}}</text>
+      </view>
+    </view>
+
+    <view class="report-section">
+      <view class="report-section-title">误判率趋势（近14天）</view>
+      <view class="report-trend-item" wx:for="{{report.misjudge_trend}}" wx:key="date">
+        <view class="row">
+          <text class="label">{{item.label}}</text>
+          <text class="value">{{item.misjudge_rate_text}}</text>
+        </view>
+        <view class="progress-track">
+          <view class="progress-fill-safe" style="width: {{item.rate_percent}};"></view>
+        </view>
+      </view>
+    </view>
+
+    <view class="btn-row">
+      <button class="btn btn-primary" bindtap="copyReportText">复制报告文本</button>
+      <button class="btn btn-ghost" bindtap="closeReport">关闭</button>
+    </view>
+  </view>
 </view>