fix(bugcollect): 修复 overview loadData 的 TypeScript 类型错误 — 改用可选链替代 ?? {}

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

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

@@ -153,14 +153,14 @@ async function loadData() {
   if (!appKey.value || gateStatus.value !== 'enabled') return
   try {
     const res = await bugCollectApi.overview(appKey.value)
-    const d = res.data.data ?? {}
+    const d = res.data.data
     overview.value = {
-      totalIssues: d.totalIssues ?? 0,
-      todayNewIssues: d.todayNewIssues ?? 0,
-      affectedUsers: d.affectedUsers ?? 0,
-      crashRate: d.crashRate ?? 0,
-      crashRateTrend: d.crashRateTrend ?? [],
-      topIssues: d.topIssues ?? [],
+      totalIssues: d?.totalIssues ?? 0,
+      todayNewIssues: d?.todayNewIssues ?? 0,
+      affectedUsers: d?.affectedUsers ?? 0,
+      crashRate: d?.crashRate ?? 0,
+      crashRateTrend: d?.crashRateTrend ?? [],
+      topIssues: d?.topIssues ?? [],
     }
   } catch {
     overview.value = { ...EMPTY }