fix(modal-repeater-table): 품목 추가 시 UI 즉시 반영되지 않는 버그 수정

- value 상수를 localValue useState로 변경하여 내부 상태 관리
- useEffect로 외부 값(formData, propValue) 변경 시 동기화
- handleChange에서 setLocalValue 호출하여 즉각적인 UI 업데이트
- RepeaterTable, ItemSelectionModal 등 모든 참조를 localValue로 변경

frontend/lib/registry/components/universal-form-modal/UniversalFormModalConfigPanel.tsx

@@ -467,6 +467,96 @@ export function UniversalFormModalConfigPanel({ config, onChange }: UniversalFor
 
                 {config.saveConfig.multiRowSave?.enabled && (
                   <div className="space-y-2 pt-2 border-t">
+                    {/* 공통 필드 선택 */}
+                    <div>
+                      <Label className="text-[10px]">공통 필드 (모든 행에 저장)</Label>
+                      <div className="mt-1 max-h-32 overflow-y-auto border rounded p-1 space-y-1">
+                        {config.sections
+                          .filter((s) => !s.repeatable)
+                          .flatMap((s) => s.fields)
+                          .map((field) => (
+                            <label key={field.id} className="flex items-center gap-1 text-[10px] cursor-pointer">
+                              <input
+                                type="checkbox"
+                                checked={config.saveConfig.multiRowSave?.commonFields?.includes(field.columnName) || false}
+                                onChange={(e) => {
+                                  const currentFields = config.saveConfig.multiRowSave?.commonFields || [];
+                                  const newFields = e.target.checked
+                                    ? [...currentFields, field.columnName]
+                                    : currentFields.filter((f) => f !== field.columnName);
+                                  updateSaveConfig({
+                                    multiRowSave: { ...config.saveConfig.multiRowSave, commonFields: newFields },
+                                  });
+                                }}
+                                className="h-3 w-3"
+                              />
+                              {field.label} ({field.columnName})
+                            </label>
+                          ))}
+                      </div>
+                      <HelpText>메인 행과 겸직 행 모두에 저장될 필드</HelpText>
+                    </div>
+
+                    {/* 메인 섹션 필드 선택 */}
+                    <div>
+                      <Label className="text-[10px]">메인 섹션 필드 (메인 행에만 저장)</Label>
+                      <div className="mt-1 max-h-32 overflow-y-auto border rounded p-1 space-y-1">
+                        {config.sections
+                          .filter((s) => !s.repeatable)
+                          .flatMap((s) => s.fields)
+                          .filter((field) => !config.saveConfig.multiRowSave?.commonFields?.includes(field.columnName))
+                          .map((field) => (
+                            <label key={field.id} className="flex items-center gap-1 text-[10px] cursor-pointer">
+                              <input
+                                type="checkbox"
+                                checked={config.saveConfig.multiRowSave?.mainSectionFields?.includes(field.columnName) || false}
+                                onChange={(e) => {
+                                  const currentFields = config.saveConfig.multiRowSave?.mainSectionFields || [];
+                                  const newFields = e.target.checked
+                                    ? [...currentFields, field.columnName]
+                                    : currentFields.filter((f) => f !== field.columnName);
+                                  updateSaveConfig({
+                                    multiRowSave: { ...config.saveConfig.multiRowSave, mainSectionFields: newFields },
+                                  });
+                                }}
+                                className="h-3 w-3"
+                              />
+                              {field.label} ({field.columnName})
+                            </label>
+                          ))}
+                      </div>
+                      <HelpText>메인 행에만 저장될 필드 (공통 필드 제외)</HelpText>
+                    </div>
+
+                    {/* 반복 섹션 선택 */}
+                    <div>
+                      <Label className="text-[10px]">반복 섹션</Label>
+                      <Select
+                        value={config.saveConfig.multiRowSave?.repeatSectionId || ""}
+                        onValueChange={(value) =>
+                          updateSaveConfig({
+                            multiRowSave: { ...config.saveConfig.multiRowSave, repeatSectionId: value },
+                          })
+                        }
+                      >
+                        <SelectTrigger className="h-6 text-[10px] mt-1">
+                          <SelectValue placeholder="반복 섹션 선택" />
+                        </SelectTrigger>
+                        <SelectContent>
+                          {config.sections
+                            .filter((s) => s.repeatable)
+                            .map((section) => (
+                              <SelectItem key={section.id} value={section.id}>
+                                {section.title}
+                              </SelectItem>
+                            ))}
+                        </SelectContent>
+                      </Select>
+                      <HelpText>겸직 등 반복 데이터가 있는 섹션</HelpText>
+                    </div>
+
+                    <Separator />
+
                     <div>
                       <Label className="text-[10px]">구분 컬럼</Label>
                       <Input