fix: [dashboard] 생산현황 shipments.shipping_cost 컬럼 미존재 에러 수정

- shipments 테이블에 shipping_cost 컬럼이 없어서 500 에러 발생
- 컬럼 추가 전까지 금액 0 고정, 건수만 집계
- TODO: shipping_cost 컬럼 추가 시 금액 집계 복원

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/Services/DashboardCeoService.php

@@ -467,12 +467,15 @@ private function getShipmentSummary(int $tenantId, string $today): array
         $monthEnd = $thisMonth->copy()->endOfMonth()->format('Y-m-d');
 
         // 예정 출고
+        // NOTE: shipments 테이블에 shipping_cost 컬럼이 아직 없음 (2026-03-19)
+        // 금액 집계는 컬럼 추가 + 입력 UI 반영 후 활성화 예정
+        // TODO: shipping_cost 컬럼 추가 시 → selectRaw에 SUM(shipping_cost) 복원
         $expected = DB::table('shipments')
             ->where('tenant_id', $tenantId)
             ->whereBetween('scheduled_date', [$monthStart, $monthEnd])
             ->whereIn('status', ['scheduled', 'ready'])
             ->whereNull('deleted_at')
-            ->selectRaw('COUNT(*) as count, COALESCE(SUM(shipping_cost), 0) as amount')
+            ->selectRaw('COUNT(*) as count')
             ->first();
 
         // 실제 출고
@@ -481,13 +484,13 @@ private function getShipmentSummary(int $tenantId, string $today): array
             ->whereBetween('scheduled_date', [$monthStart, $monthEnd])
             ->whereIn('status', ['shipping', 'completed'])
             ->whereNull('deleted_at')
-            ->selectRaw('COUNT(*) as count, COALESCE(SUM(shipping_cost), 0) as amount')
+            ->selectRaw('COUNT(*) as count')
             ->first();
 
         return [
-            'expected_amount' => (int) ($expected->amount ?? 0),
+            'expected_amount' => 0, // shipping_cost 컬럼 추가 전까지 0 고정
             'expected_count' => (int) ($expected->count ?? 0),
-            'actual_amount' => (int) ($actual->amount ?? 0),
+            'actual_amount' => 0,   // shipping_cost 컬럼 추가 전까지 0 고정
             'actual_count' => (int) ($actual->count ?? 0),
         ];
     }