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/molecules/CopyableCell.tsx

@@ -0,0 +1,61 @@
+'use client';
+
+import { ReactNode, useCallback, useState } from 'react';
+import { Check, Copy } from 'lucide-react';
+import { cn } from '@/lib/utils';
+
+interface CopyableCellProps {
+  /** 복사할 텍스트 값 */
+  value: string;
+  /** 셀에 표시할 내용 (기본: value) */
+  children?: ReactNode;
+  /** 추가 클래스 */
+  className?: string;
+}
+
+/**
+ * 테이블 셀 내 텍스트에 hover 시 복사 버튼을 표시하는 래퍼
+ *
+ * 사용법:
+ * ```tsx
+ * <TableCell>
+ *   <CopyableCell value={item.itemCode}>{item.itemCode}</CopyableCell>
+ * </TableCell>
+ * ```
+ */
+export function CopyableCell({ value, children, className }: CopyableCellProps) {
+  const [copied, setCopied] = useState(false);
+
+  const handleCopy = useCallback((e: React.MouseEvent) => {
+    e.stopPropagation();
+    e.preventDefault();
+    navigator.clipboard.writeText(value).then(() => {
+      setCopied(true);
+      setTimeout(() => setCopied(false), 1500);
+    });
+  }, [value]);
+
+  return (
+    <span className={cn('group/copy relative block max-w-full overflow-hidden', className)}>
+      <span className="block truncate">{children ?? value}</span>
+      <button
+        type="button"
+        onClick={handleCopy}
+        className={cn(
+          'absolute right-0 top-1/2 -translate-y-1/2',
+          'opacity-0 group-hover/copy:opacity-100 transition-opacity',
+          'pl-4 pr-0.5 py-0.5',
+          'bg-gradient-to-l from-background via-background to-transparent',
+          copied && 'opacity-100',
+        )}
+        title="복사"
+      >
+        {copied ? (
+          <Check className="h-3.5 w-3.5 text-green-500" />
+        ) : (
+          <Copy className="h-3.5 w-3.5 text-muted-foreground hover:text-foreground" />
+        )}
+      </button>
+    </span>
+  );
+}

src/components/molecules/DateRangeSelector.tsx

@@ -90,7 +90,7 @@ export function DateRangeSelector({
   extraActions,
   hidePresets = false,
   hideDateInputs = false,
-  dateInputWidth = 'w-[140px]',
+  dateInputWidth: _dateInputWidth = 'w-[140px]',
   presetsPosition = 'inline',
   variant = 'combined',
 }: DateRangeSelectorProps) {

src/components/molecules/FormField.tsx

@@ -11,7 +11,6 @@ import { AlertCircle } from "lucide-react";
 import { PhoneInput } from "../ui/phone-input";
 import { BusinessNumberInput } from "../ui/business-number-input";
 import { PersonalNumberInput } from "../ui/personal-number-input";
-import { NumberInput } from "../ui/number-input";
 import { CurrencyInput } from "../ui/currency-input";
 import { QuantityInput } from "../ui/quantity-input";
 import { DatePicker } from "../ui/date-picker";
@@ -104,9 +103,9 @@ export function FormField({
   // 새 입력 타입 전용 옵션
   showValidation,
   maskBack,
-  allowDecimal,
-  decimalPlaces,
-  useComma,
+  allowDecimal: _allowDecimal,
+  decimalPlaces: _decimalPlaces,
+  useComma: _useComma,
   suffix,
   showButtons,
   maxLength,

src/components/molecules/MobileFilter.tsx

@@ -96,7 +96,7 @@ function countActiveFilters(
 /**
  * 필터 필드 요약 텍스트 생성
  */
-function getFieldSummary(
+function _getFieldSummary(
   field: FilterFieldConfig,
   value: string | string[] | undefined
 ): string {

src/components/molecules/StandardDialog.tsx

@@ -64,7 +64,7 @@ export function StandardDialog({
   children,
   footer,
   size = "md",
-  showClose = true,
+  showClose: _showClose = true,
   className,
 }: StandardDialogProps) {
   return (

src/components/molecules/StatusBadge.tsx

@@ -3,7 +3,6 @@
 import { Badge } from "@/components/ui/badge";
 import { BadgeSm } from "@/components/atoms/BadgeSm";
 import { LucideIcon } from "lucide-react";
-import { BADGE_STYLE_PRESETS, type StatusStylePreset } from "@/lib/utils/status-config";
 
 /**
  * 상태 뱃지 컴포넌트
@@ -61,7 +60,7 @@ export function StatusBadge({
   icon: Icon,
   className = "",
   size = "md",
-  showDot
+  showDot: _showDot
 }: StatusBadgeProps) {
   // variant에 따른 기본 스타일
   const variantStyles: Record<string, string> = {

src/components/molecules/index.ts

@@ -15,4 +15,6 @@ export type { Quarter } from "./YearQuarterFilter";
 export { GenericCRUDDialog } from "./GenericCRUDDialog";
 export type { GenericCRUDDialogProps, CRUDFieldDefinition } from "./GenericCRUDDialog";
 
-export { ReorderButtons } from "./ReorderButtons";
+export { ReorderButtons } from "./ReorderButtons";
+
+export { CopyableCell } from "./CopyableCell";