feat(admin-dashboard): clarify plan share top5 meta with total and coverage

app/Http/Controllers/Admin/DashboardController.php

@@ -197,6 +197,14 @@ class DashboardController extends Controller
             ->get();
 
         // 占比卡（最小可用）：近 7 天按套餐统计平台订单数量 TopN
+        // 说明：
+        // - Top5 数据用于“对比/聚焦”（减少噪音）
+        // - total 用于计算“占比/覆盖率”，避免将 Top5 误当全量
+        $planOrderShareTotal = PlatformOrder::query()
+            ->whereBetween('created_at', [$trendStart, $trendEnd])
+            ->whereNotNull('plan_id')
+            ->count();
+
         $planOrderShare = PlatformOrder::query()
             ->selectRaw('plan_id, COUNT(*) as cnt')
             ->whereBetween('created_at', [$trendStart, $trendEnd])
@@ -243,6 +251,7 @@ class DashboardController extends Controller
             'platformOrderTrend7d' => $platformOrderTrend7d,
             'recentPlatformOrders' => $recentPlatformOrders,
             'planOrderShare' => $planOrderShare,
+            'planOrderShareTotal' => (int) $planOrderShareTotal,
             'planIdToName' => $planIdToName,
             'merchantRevenueRank7d' => $merchantRevenueRank7d,
             'merchantIdToName' => $merchantIdToName,