feat: ESLint 정리 및 전체 코드 품질 개선

- eslint.config.mjs 규칙 강화 및 정리
- 전역 unused import/변수 제거 (312개 파일)
- next.config.ts, middleware, proxy route 개선
- CopyableCell molecule 추가
- 회계/결재/HR/생산/건설/품질/영업 등 전 도메인 lint 정리
- IntegratedListTemplateV2, DataTable, MobileCard 등 공통 컴포넌트 개선
- execute-server-action 에러 핸들링 보강

src/components/pricing-distribution/PriceDistributionDetail.tsx

@@ -201,7 +201,7 @@ export function PriceDistributionDetail({ id, mode: propMode }: Props) {
   };
 
   // 상태 뱃지
-  const renderStatusBadge = (status: DistributionStatus) => {
+  const _renderStatusBadge = (status: DistributionStatus) => {
     const style = DISTRIBUTION_STATUS_STYLES[status];
     const label = DISTRIBUTION_STATUS_LABELS[status];
     return (

src/components/pricing-distribution/PriceDistributionList.tsx

@@ -50,7 +50,7 @@ import {
 export function PriceDistributionList() {
   const router = useRouter();
   const [data, setData] = useState<PriceDistributionListItem[]>([]);
-  const [isLoading, setIsLoading] = useState(true);
+  const [_isLoading, setIsLoading] = useState(true);
   const [showRegisterDialog, setShowRegisterDialog] = useState(false);
   const [isRegistering, setIsRegistering] = useState(false);
   const pageSize = 20;
@@ -150,11 +150,11 @@ export function PriceDistributionList() {
   // 테이블 컬럼
   const tableColumns: TableColumn[] = useMemo(() => [
     { key: 'rowNumber', label: '번호', className: 'w-[60px] text-center' },
-    { key: 'distributionNo', label: '단가배포번호', className: 'min-w-[120px]' },
-    { key: 'distributionName', label: '단가배포명', className: 'min-w-[150px]' },
+    { key: 'distributionNo', label: '단가배포번호', className: 'min-w-[120px]', copyable: true },
+    { key: 'distributionName', label: '단가배포명', className: 'min-w-[150px]', copyable: true },
     { key: 'status', label: '상태', className: 'min-w-[100px]' },
-    { key: 'author', label: '작성자', className: 'min-w-[100px]' },
-    { key: 'createdAt', label: '등록일', className: 'min-w-[120px]' },
+    { key: 'author', label: '작성자', className: 'min-w-[100px]', copyable: true },
+    { key: 'createdAt', label: '등록일', className: 'min-w-[120px]', copyable: true },
   ], []);
 
   // 테이블 행 렌더링