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/organisms/DataTable.tsx

@@ -7,7 +7,7 @@ import { Button } from "@/components/ui/button";
 import { ChevronLeft, ChevronRight, LucideIcon } from "lucide-react";
 import { StatusBadge, StatusType } from "@/components/molecules/StatusBadge";
 import { IconWithBadge } from "@/components/molecules/IconWithBadge";
-import { TableActions, TableAction } from "@/components/molecules/TableActions";
+import { TableActions } from "@/components/molecules/TableActions";
 import { Badge } from "@/components/ui/badge";
 import { cn } from "@/lib/utils";
 import { formatNumber } from '@/lib/utils/amount';
@@ -100,20 +100,22 @@ function renderCell<T>(column: Column<T>, value: any, row: T, index?: number): R
     case "number":
       return <span className="font-mono">{formatNumber(formattedValue)}</span>;
 
-    case "currency":
+    case "currency": {
       const locale = column.currencyConfig?.locale || "ko-KR";
       const currency = column.currencyConfig?.currency || "KRW";
       const currencyValue = typeof formattedValue === "number"
         ? formattedValue.toLocaleString(locale, { style: "currency", currency })
         : formattedValue;
       return <span className="font-mono">{currencyValue}</span>;
+    }
 
-    case "date":
+    case "date": {
       if (!formattedValue) return "-";
       const dateValue = new Date(formattedValue);
       return <span className="text-sm">{dateValue.toLocaleDateString("ko-KR")}</span>;
+    }
 
-    case "datetime":
+    case "datetime": {
       if (!formattedValue) return "-";
       const datetimeValue = new Date(formattedValue);
       return (
@@ -121,6 +123,7 @@ function renderCell<T>(column: Column<T>, value: any, row: T, index?: number): R
           {datetimeValue.toLocaleDateString("ko-KR")} {datetimeValue.toLocaleTimeString("ko-KR", { hour: "2-digit", minute: "2-digit" })}
         </span>
       );
+    }
 
     case "status":
       return (
@@ -141,7 +144,7 @@ function renderCell<T>(column: Column<T>, value: any, row: T, index?: number): R
         </Badge>
       );
 
-    case "icon":
+    case "icon": {
       const IconComponent = formattedValue as LucideIcon;
       return IconComponent ? (
         <IconWithBadge
@@ -151,6 +154,7 @@ function renderCell<T>(column: Column<T>, value: any, row: T, index?: number): R
           size={column.iconConfig?.size}
         />
       ) : null;
+    }
 
     case "iconBadge":
       // value should be { icon, label, badge }
@@ -168,10 +172,11 @@ function renderCell<T>(column: Column<T>, value: any, row: T, index?: number): R
       }
       return formattedValue;
 
-    case "actions":
+    case "actions": {
       // render 함수가 TableAction[] 배열을 반환해야 함
       const actions = Array.isArray(formattedValue) ? formattedValue : [];
       return actions.length > 0 ? <TableActions actions={actions} /> : null;
+    }
 
     case "custom":
       // 커스텀 타입은 이미 render 함수에서 처리됨