feat: [workorder] 절곡 작업일지 bending_images R2 presigned URL 반환

- getWorkLog()에 bending_images 맵 추가 (22개 정적 이미지)
- buildBendingImageUrls() 메서드 추가
- Storage import 추가
- document->data null 체크 추가
- stats에 draft 상태를 reception_count에 포함

app/Services/WorkOrderService.php

@@ -3,6 +3,7 @@
 namespace App\Services;
 
 use App\Models\Documents\Document;
+use Illuminate\Support\Facades\Storage;
 use App\Models\Documents\DocumentTemplate;
 use App\Models\Orders\Order;
 use App\Models\Process;
@@ -3445,7 +3446,7 @@ public function getWorkLog(int $workOrderId): array
                     'comment' => $a->comment,
                     'acted_at' => $a->acted_at,
                 ])->toArray(),
-                'data' => $document->data->map(fn ($d) => [
+                'data' => ($document->data ?? collect())->map(fn ($d) => [
                     'field_key' => $d->field_key,
                     'field_value' => $d->field_value,
                     'section_id' => $d->section_id,
@@ -3456,9 +3457,41 @@ public function getWorkLog(int $workOrderId): array
             'auto_values' => $this->buildWorkLogAutoValues($workOrder),
             'work_order_info' => $this->buildWorkOrderInfo($workOrder),
             'work_stats' => $this->calculateWorkStats($workOrder),
+            'bending_images' => $this->buildBendingImageUrls(),
         ];
     }
 
+    /**
+     * 절곡 정적 이미지 R2 presigned URL 맵 생성
+     */
+    private function buildBendingImageUrls(): array
+    {
+        $images = [];
+        $paths = [
+            'guiderail_KSS01_wall_120x70', 'guiderail_KSS01_side_120x120',
+            'guiderail_KSS02_wall_120x70', 'guiderail_KSS02_side_120x120',
+            'guiderail_KSE01_wall_120x70', 'guiderail_KSE01_side_120x120',
+            'guiderail_KWE01_wall_120x70', 'guiderail_KWE01_side_120x120',
+            'guiderail_KTE01_wall_130x75', 'guiderail_KTE01_side_130x125',
+            'guiderail_KQTS01_wall_130x75', 'guiderail_KQTS01_side_130x125',
+            'bottombar_KSS01', 'bottombar_KSS02', 'bottombar_KSE01',
+            'bottombar_KWE01', 'bottombar_KTE01', 'bottombar_KQTS01',
+            'box_both', 'box_bottom', 'box_rear',
+            'smokeban',
+        ];
+
+        foreach ($paths as $name) {
+            $category = str_contains($name, 'guiderail') ? 'guiderail'
+                : (str_contains($name, 'bottombar') ? 'bottombar'
+                    : (str_contains($name, 'box') ? 'box' : 'part'));
+            $r2Path = "images/bending/{$category}/{$name}.jpg";
+
+            $images[$name] = Storage::disk('r2')->temporaryUrl($r2Path, now()->addMinutes(30));
+        }
+
+        return $images;
+    }
+
     /**
      * 작업일지 생성/수정 (Document 기반)
      *