feat: [품질관리] 수주선택 모달 발주처별 비활성화 제약 추가

- SearchableSelectionModal에 isItemDisabled 콜백 prop 추가 (공통)
  - renderItem에 isDisabled 3번째 파라미터 전달 (하위호환)
  - disabled 아이템 클릭 차단 + opacity/cursor 스타일 적용
  - 전체선택 시 disabled 아이템 제외
- OrderSelectModal: 선택된 발주처와 다른 발주처의 수주 비활성화
  - 이미 선택된 아이템은 해제 가능 (disabled 예외)

src/components/quality/InspectionManagement/OrderSelectModal.tsx

@@ -70,6 +70,11 @@ export function OrderSelectModal({
       onSelect={onSelect}
       confirmLabel="선택"
       allowSelectAll
+      isItemDisabled={(item, selectedItems) => {
+        if (selectedItems.length === 0) return false;
+        const selectedClient = selectedItems[0].clientName;
+        return item.clientName !== selectedClient;
+      }}
       listWrapper={(children, selectState) => (
         <Table>
           <TableHeader>
@@ -95,10 +100,10 @@ export function OrderSelectModal({
           </TableBody>
         </Table>
       )}
-      renderItem={(item, isSelected) => (
-        <TableRow className="cursor-pointer hover:bg-muted/50">
+      renderItem={(item, isSelected, isDisabled) => (
+        <TableRow className={isDisabled ? '' : 'hover:bg-muted/50'}>
           <TableCell onClick={(e) => e.stopPropagation()}>
-            <Checkbox checked={isSelected} />
+            <Checkbox checked={isSelected} disabled={isDisabled} />
           </TableCell>
           <TableCell>{item.orderNumber}</TableCell>
           <TableCell>{item.siteName}</TableCell>