refactor: UI 컴포넌트 추상화 및 입금/출금 등록 버튼 추가

- 입금관리, 출금관리 리스트에 등록 버튼 추가
- skeleton, confirm-dialog, empty-state, status-badge UI 컴포넌트 추가
- document-system 컴포넌트 추상화 (ApprovalLine, DocumentHeader 등)
- 여러 페이지 컴포넌트 리팩토링 및 코드 정리

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/components/board/BoardList/index.tsx

@@ -17,16 +17,7 @@ import { ContentLoadingSpinner } from '@/components/ui/loading-spinner';
 import { Button } from '@/components/ui/button';
 import { Checkbox } from '@/components/ui/checkbox';
 import { TableRow, TableCell } from '@/components/ui/table';
-import {
-  AlertDialog,
-  AlertDialogAction,
-  AlertDialogCancel,
-  AlertDialogContent,
-  AlertDialogDescription,
-  AlertDialogFooter,
-  AlertDialogHeader,
-  AlertDialogTitle,
-} from '@/components/ui/alert-dialog';
+import { DeleteConfirmDialog } from '@/components/ui/confirm-dialog';
 import {
   UniversalListPage,
   type UniversalListConfig,
@@ -382,23 +373,13 @@ export function BoardList() {
       },
 
       renderDialogs: () => (
-        <AlertDialog open={showDeleteDialog} onOpenChange={setShowDeleteDialog}>
-          <AlertDialogContent>
-            <AlertDialogHeader>
-              <AlertDialogTitle>게시글 삭제</AlertDialogTitle>
-              <AlertDialogDescription>정말 삭제하시겠습니까?</AlertDialogDescription>
-            </AlertDialogHeader>
-            <AlertDialogFooter>
-              <AlertDialogCancel>취소</AlertDialogCancel>
-              <AlertDialogAction
-                onClick={handleConfirmDelete}
-                className="bg-red-600 hover:bg-red-700"
-              >
-                삭제
-              </AlertDialogAction>
-            </AlertDialogFooter>
-          </AlertDialogContent>
-        </AlertDialog>
+        <DeleteConfirmDialog
+          open={showDeleteDialog}
+          onOpenChange={setShowDeleteDialog}
+          onConfirm={handleConfirmDelete}
+          title="게시글 삭제"
+          description="정말 삭제하시겠습니까?"
+        />
       ),
     }),
     [