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/accounting/BadDebtCollection/actions.ts

@@ -16,20 +16,13 @@
 
 import { revalidatePath } from 'next/cache';
 import { executeServerAction, type ActionResult } from '@/lib/api/execute-server-action';
+import type { PaginatedApiResponse } from '@/lib/api/types';
 import type { BadDebtRecord, BadDebtItem, CollectionStatus } from './types';
 
 const API_URL = process.env.NEXT_PUBLIC_API_URL;
 
 // ===== API 응답 타입 =====
 
-interface PaginatedResponse<T> {
-  current_page: number;
-  data: T[];
-  total: number;
-  per_page: number;
-  last_page: number;
-}
-
 interface BadDebtItemApiData {
   id: number;
   debt_amount: number;
@@ -176,7 +169,7 @@ export async function getBadDebts(params?: {
 
   const result = await executeServerAction({
     url: `${API_URL}/api/v1/bad-debts?${searchParams.toString()}`,
-    transform: (data: PaginatedResponse<BadDebtApiData>) => data.data.map(transformApiToFrontend),
+    transform: (data: PaginatedApiResponse<BadDebtApiData>) => data.data.map(transformApiToFrontend),
     errorMessage: '악성채권 목록 조회에 실패했습니다.',
   });
   return result.data || [];