feat: 거래처관리 등록 버튼 추가 및 dead code 정리

- 거래처관리 리스트 페이지에 createButton(거래처 등록) 추가
- 미사용 index.ts 배럴 파일 삭제 (index.tsx가 우선 resolve되어 dead code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/components/accounting/VendorManagement/index.ts

@@ -1,54 +0,0 @@
-/**
- * 거래처 관리 컴포넌트 Export
- */
-
-// 클라이언트 컴포넌트
-export { VendorManagementClient } from './VendorManagementClient';
-export { VendorManagementClient as VendorManagement } from './VendorManagementClient';
-
-// 상세/수정 컴포넌트
-export { VendorDetail } from './VendorDetail';
-
-// 타입
-export type {
-  Vendor,
-  VendorCategory,
-  CreditRating,
-  TransactionGrade,
-  BadDebtStatus,
-  SortOption,
-  VendorMemo,
-  ClientApiData,
-  ApiResponse,
-  PaginatedResponse,
-} from './types';
-
-// 상수
-export {
-  VENDOR_CATEGORY_LABELS,
-  VENDOR_CATEGORY_OPTIONS,
-  VENDOR_CATEGORY_COLORS,
-  CREDIT_RATING_OPTIONS,
-  CREDIT_RATING_COLORS,
-  TRANSACTION_GRADE_LABELS,
-  TRANSACTION_GRADE_OPTIONS,
-  TRANSACTION_GRADE_COLORS,
-  BAD_DEBT_STATUS_LABELS,
-  BAD_DEBT_STATUS_OPTIONS,
-  BAD_DEBT_STATUS_COLORS,
-  SORT_OPTIONS,
-  BANK_OPTIONS,
-  PAYMENT_DAY_OPTIONS,
-  CLIENT_TYPE_TO_CATEGORY,
-  CATEGORY_TO_CLIENT_TYPE,
-} from './types';
-
-// Server Actions
-export {
-  getClients,
-  getClientById,
-  createClient,
-  updateClient,
-  deleteClient,
-  toggleClientActive,
-} from './actions';

src/components/accounting/VendorManagement/index.tsx

@@ -109,6 +109,12 @@ export function VendorManagement({ initialData, initialTotal }: VendorManagement
       icon: Building2,
       basePath: '/accounting/vendors',
 
+      // 등록 버튼
+      createButton: {
+        label: '거래처 등록',
+        onClick: () => router.push('/ko/accounting/vendors?mode=new'),
+      },
+
       // ID 추출
       idField: 'id',
 
@@ -428,7 +434,7 @@ export function VendorManagement({ initialData, initialTotal }: VendorManagement
         />
       ),
     }),
-    [initialData, stats, handleRowClick, handleEdit]
+    [initialData, stats, handleRowClick, handleEdit, router]
   );
 
   return <UniversalListPage config={config} initialData={initialData} />;