Fix ReportService: invoices don't have branch_id, scope via billable morph

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

app/Domain/Shared/Services/ReportService.php

@@ -17,12 +17,12 @@ public function financialSummary(string $from, string $to, ?int $branchId = null
     {
         return [
             'total_invoiced' => Invoice::whereBetween('created_at', [$from, $to])
-                ->when($branchId, fn ($q) => $q->where('branch_id', $branchId))->sum('total_amount'),
+                ->when($branchId, fn ($q) => $q->whereHasMorph('billable', [Participant::class], fn ($p) => $p->where('branch_id', $branchId)))->sum('total_amount'),
             'total_collected' => Payment::where('status', 'confirmed')
                 ->whereBetween('created_at', [$from, $to])
                 ->when($branchId, fn ($q) => $q->where('branch_id', $branchId))->sum('amount'),
             'total_outstanding' => Invoice::whereIn('status', ['sent', 'partially_paid', 'overdue'])
-                ->when($branchId, fn ($q) => $q->where('branch_id', $branchId))->sum('due_amount'),
+                ->when($branchId, fn ($q) => $q->whereHasMorph('billable', [Participant::class], fn ($p) => $p->where('branch_id', $branchId)))->sum('due_amount'),
             'pos_revenue' => POSTransaction::whereBetween('processed_at', [$from, $to])
                 ->when($branchId, fn ($q) => $q->where('branch_id', $branchId))->sum('total_amount'),
             'payment_methods' => Payment::where('status', 'confirmed')