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/process-management/actions.ts

@@ -2,6 +2,7 @@
 
 
 import { executeServerAction } from '@/lib/api/execute-server-action';
+import type { PaginatedApiResponse } from '@/lib/api/types';
 import type { Process, ProcessFormData, ClassificationRule, IndividualItem, ProcessStep } from '@/types/process';
 
 // ============================================================================
@@ -65,14 +66,6 @@ interface ApiResponse<T> {
   data: T;
 }
 
-interface PaginatedResponse<T> {
-  current_page: number;
-  data: T[];
-  last_page: number;
-  per_page: number;
-  total: number;
-}
-
 // ============================================================================
 // 데이터 변환 함수
 // ============================================================================
@@ -228,7 +221,7 @@ export async function getProcessList(params?: {
   if (params?.status) searchParams.set('status', params.status);
   if (params?.process_type) searchParams.set('process_type', params.process_type);
 
-  const result = await executeServerAction<PaginatedResponse<ApiProcess>>({
+  const result = await executeServerAction<PaginatedApiResponse<ApiProcess>>({
     url: `${API_URL}/api/v1/processes?${searchParams.toString()}`,
     errorMessage: '공정 목록 조회에 실패했습니다.',
   });