fix(bugcollect): 修复趋势图不显示 — API 响应结构为 {issueId, points[]} 而非数组

trend API 返回 { issueId, points: [...] }，前端误以为是数组直接调用 .map()
导致 TypeError 被 catch 静默吞掉，图表从不渲染。
修复：正确读取 res.data.data.points，并更新类型定义。

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tenant-platform/src/api/bugcollect.ts

@@ -162,7 +162,7 @@ export const bugCollectApi = {
   },
 
   issueTrend(id: string | number, params?: { from?: string; to?: string }) {
-    return client.get<{ data: { date: string; count: number; affectedUsers: number }[] }>(
+    return client.get<{ data: { issueId: number; points: { date: string; count: number; affectedUsers: number }[] } }>(
       `/bugcollect/v1/issues/${id}/trend`,
       { params },
     )

tenant-platform/src/views/bug-collect/BugCollectIssueDetail.vue

@@ -241,7 +241,7 @@ async function loadTrend() {
   if (!id || !trendChartRef.value) return
   try {
     const res = await bugCollectApi.issueTrend(id)
-    const trend = res.data.data
+    const trend = res.data.data?.points
     if (!trend || !trendChartRef.value) return
 
     if (!trendChart) trendChart = echarts.init(trendChartRef.value)