feat: 매입 일괄 업데이트 API 추가

- 매입유형 일괄 변경 API (POST /purchases/bulk-update-type)
- 세금계산서 수취 일괄 설정 API (POST /purchases/bulk-update-tax-received)
- FormRequest 검증 클래스 추가
- Swagger 문서 추가

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

@@ -4,6 +4,8 @@
 
 use App\Helpers\ApiResponse;
 use App\Http\Controllers\Controller;
+use App\Http\Requests\V1\Purchase\BulkUpdatePurchaseTypeRequest;
+use App\Http\Requests\V1\Purchase\BulkUpdateTaxReceivedRequest;
 use App\Http\Requests\V1\Purchase\StorePurchaseRequest;
 use App\Http\Requests\V1\Purchase\UpdatePurchaseRequest;
 use App\Services\PurchaseService;
@@ -103,4 +105,36 @@ public function summary(Request $request)
 
         return ApiResponse::success($summary, __('message.fetched'));
     }
+
+    /**
+     * 매입유형 일괄 변경
+     */
+    public function bulkUpdatePurchaseType(BulkUpdatePurchaseTypeRequest $request)
+    {
+        $updatedCount = $this->service->bulkUpdatePurchaseType(
+            $request->getIds(),
+            $request->getPurchaseType()
+        );
+
+        return ApiResponse::success(
+            ['updated_count' => $updatedCount],
+            __('message.bulk_updated')
+        );
+    }
+
+    /**
+     * 세금계산서 수취 일괄 설정
+     */
+    public function bulkUpdateTaxReceived(BulkUpdateTaxReceivedRequest $request)
+    {
+        $updatedCount = $this->service->bulkUpdateTaxReceived(
+            $request->getIds(),
+            $request->getTaxInvoiceReceived()
+        );
+
+        return ApiResponse::success(
+            ['updated_count' => $updatedCount],
+            __('message.bulk_updated')
+        );
+    }
 }