refactor(WEB): SearchableSelectionModal 공통화 및 actions lookup 통합

- SearchableSelectionModal<T> 제네릭 컴포넌트 추출 (organisms)
- 검색 모달 5개 리팩토링: SupplierSearch, QuotationSelect, SalesOrderSelect, OrderSelect, ItemSearch
- shared-lookups API 유틸 추가 (거래처/품목/수주 등 공통 조회)
- create-crud-service 확장 (lookup, search 메서드)
- actions.ts 20+개 파일 lookup 패턴 통일
- 공통 페이지 패턴 가이드 문서 추가
- CLAUDE.md Common Component Usage Rules 추가

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/settings/AccountManagement/actions.ts

@@ -2,6 +2,7 @@
 
 
 import { executeServerAction, type ActionResult } from '@/lib/api/execute-server-action';
+import type { PaginatedApiResponse } from '@/lib/api/types';
 import { isNextRedirectError } from '@/lib/utils/redirect-error';
 import type { Account, AccountFormData, AccountStatus } from './types';
 import { BANK_LABELS } from './types';
@@ -23,13 +24,7 @@ interface BankAccountApiData {
   updated_at?: string;
 }
 
-interface BankAccountPaginatedResponse {
-  data: BankAccountApiData[];
-  current_page: number;
-  last_page: number;
-  per_page: number;
-  total: number;
-}
+type BankAccountPaginatedResponse = PaginatedApiResponse<BankAccountApiData>;
 
 // ===== 데이터 변환 =====
 function transformApiToFrontend(apiData: BankAccountApiData): Account {