feat(pricing): 단가관리 stats, bulkDestroy API 추가

- GET /pricing/stats: 단가 통계 조회 (total, draft, finalized, expired)
- DELETE /pricing/bulk: 단가 일괄 삭제 (확정된 단가 제외)
- PriceBulkDeleteRequest FormRequest 추가
- PricingService.stats(), bulkDestroy() 메서드 구현

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

app/Http/Controllers/Api/V1/PricingController.php

@@ -4,6 +4,7 @@
 
 use App\Helpers\ApiResponse;
 use App\Http\Controllers\Controller;
+use App\Http\Requests\Pricing\PriceBulkDeleteRequest;
 use App\Http\Requests\Pricing\PriceByItemsRequest;
 use App\Http\Requests\Pricing\PriceCostRequest;
 use App\Http\Requests\Pricing\PriceIndexRequest;
@@ -124,4 +125,29 @@ public function cost(PriceCostRequest $request)
             return ['data' => $data, 'message' => __('message.fetched')];
         });
     }
+
+    /**
+     * 단가 통계 조회
+     */
+    public function stats()
+    {
+        return ApiResponse::handle(function () {
+            $data = $this->service->stats();
+
+            return ['data' => $data, 'message' => __('message.fetched')];
+        });
+    }
+
+    /**
+     * 단가 일괄 삭제
+     */
+    public function bulkDestroy(PriceBulkDeleteRequest $request)
+    {
+        return ApiResponse::handle(function () use ($request) {
+            $validated = $request->validated();
+            $deletedCount = $this->service->bulkDestroy($validated['ids']);
+
+            return ['data' => ['deleted_count' => $deletedCount], 'message' => __('message.deleted')];
+        });
+    }
 }

app/Http/Requests/Pricing/PriceBulkDeleteRequest.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Http\Requests\Pricing;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class PriceBulkDeleteRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'ids' => 'required|array|min:1',
+            'ids.*' => 'required|integer|min:1',
+        ];
+    }
+
+    public function messages(): array
+    {
+        return [
+            'ids.required' => __('validation.required', ['attribute' => 'ids']),
+            'ids.array' => __('validation.array', ['attribute' => 'ids']),
+            'ids.min' => __('validation.min.array', ['attribute' => 'ids', 'min' => 1]),
+            'ids.*.required' => __('validation.required', ['attribute' => 'id']),
+            'ids.*.integer' => __('validation.integer', ['attribute' => 'id']),
+        ];
+    }
+}

app/Services/PricingService.php

@@ -537,4 +537,65 @@ private function shouldRecalculateSalesPrice(array $data): bool
 
         return false;
     }
+
+    /**
+     * 단가 통계 조회
+     */
+    public function stats(): array
+    {
+        $tenantId = $this->tenantId();
+
+        $baseQuery = Price::where('tenant_id', $tenantId);
+
+        $total = (clone $baseQuery)->count();
+        $draft = (clone $baseQuery)->where('status', 'draft')->count();
+        $finalized = (clone $baseQuery)->where('status', 'finalized')->count();
+        $expired = (clone $baseQuery)->where('status', 'expired')->count();
+
+        return [
+            'total' => $total,
+            'draft' => $draft,
+            'finalized' => $finalized,
+            'expired' => $expired,
+        ];
+    }
+
+    /**
+     * 단가 일괄 삭제 (soft delete)
+     */
+    public function bulkDestroy(array $ids): int
+    {
+        $tenantId = $this->tenantId();
+        $userId = $this->apiUserId();
+
+        return DB::transaction(function () use ($ids, $tenantId, $userId) {
+            $prices = Price::query()
+                ->where('tenant_id', $tenantId)
+                ->whereIn('id', $ids)
+                ->get();
+
+            if ($prices->isEmpty()) {
+                throw new NotFoundHttpException(__('error.not_found'));
+            }
+
+            $deletedCount = 0;
+            foreach ($prices as $price) {
+                // 확정된 단가는 삭제 불가
+                if ($price->is_final) {
+                    continue;
+                }
+
+                // 삭제 전 스냅샷 저장
+                $beforeSnapshot = $price->toSnapshot();
+                $this->createRevision($price, $beforeSnapshot, $userId, __('message.pricing.deleted'));
+
+                $price->deleted_by = $userId;
+                $price->save();
+                $price->delete();
+                $deletedCount++;
+            }
+
+            return $deletedCount;
+        });
+    }
 }

routes/api.php

@@ -989,8 +989,10 @@
         // Pricing (단가 관리)
         Route::prefix('pricing')->group(function () {
             Route::get('', [PricingController::class, 'index'])->name('v1.pricing.index');                                      // 목록
+            Route::get('/stats', [PricingController::class, 'stats'])->name('v1.pricing.stats');                                // 통계
             Route::get('/cost', [PricingController::class, 'cost'])->name('v1.pricing.cost');                                   // 원가 조회
             Route::post('/by-items', [PricingController::class, 'byItems'])->name('v1.pricing.by-items');                       // 품목별 단가 현황
+            Route::delete('/bulk', [PricingController::class, 'bulkDestroy'])->name('v1.pricing.bulk-destroy');                 // 일괄 삭제
             Route::post('', [PricingController::class, 'store'])->name('v1.pricing.store');                                     // 등록
             Route::get('/{id}', [PricingController::class, 'show'])->whereNumber('id')->name('v1.pricing.show');                // 상세
             Route::put('/{id}', [PricingController::class, 'update'])->whereNumber('id')->name('v1.pricing.update');            // 수정