feat(repeat-screen-modal): 집계 저장 및 채번 규칙 값 저장 기능 추가

- RepeatScreenModal 집계 결과를 연관 테이블에 저장하는 기능 추가
- ButtonPrimary 저장 시 채번 규칙 값(shipment_plan_no) 함께 저장
- _repeatScreenModal_* 데이터 감지 시 메인 테이블 중복 저장 방지
- 기존 행 수정 모드(_isEditing) 지원
- AggregationSaveConfig 타입 및 ConfigPanel UI 추가

frontend/lib/registry/components/repeat-screen-modal/RepeatScreenModalConfigPanel.tsx

@@ -766,7 +766,7 @@ function AggregationConfigItem({
   const currentSourceType = agg.sourceType || "column";
 
   return (
-    <div className="border rounded p-2 space-y-1.5 bg-background overflow-hidden min-w-0">
+    <div className="border rounded p-2 space-y-1.5 bg-background min-w-0">
       <div className="flex items-center justify-between">
         <div className="flex items-center gap-1 min-w-0">
           <Badge 
@@ -922,6 +922,161 @@ function AggregationConfigItem({
           />
         </div>
       </div>
+
+      {/* 🆕 v3.9: 저장 설정 */}
+      <AggregationSaveConfigSection
+        agg={agg}
+        sourceTable={sourceTable}
+        allTables={allTables}
+        onUpdate={onUpdate}
+      />
+    </div>
+  );
+}
+
+// 🆕 v3.9: 집계 저장 설정 섹션
+function AggregationSaveConfigSection({
+  agg,
+  sourceTable,
+  allTables,
+  onUpdate,
+}: {
+  agg: AggregationConfig;
+  sourceTable: string;
+  allTables: { tableName: string; displayName?: string }[];
+  onUpdate: (updates: Partial<AggregationConfig>) => void;
+}) {
+  const saveConfig = agg.saveConfig || { enabled: false, autoSave: false, targetTable: "", targetColumn: "", joinKey: { sourceField: "", targetField: "" } };
+
+  const updateSaveConfig = (updates: Partial<typeof saveConfig>) => {
+    onUpdate({
+      saveConfig: {
+        ...saveConfig,
+        ...updates,
+      },
+    });
+  };
+
+  return (
+    <div className="space-y-2 pt-2 border-t border-dashed">
+      <div className="flex items-center justify-between">
+        <Label className="text-[9px] font-semibold">연관 테이블 저장</Label>
+        <Switch
+          checked={saveConfig.enabled}
+          onCheckedChange={(checked) => updateSaveConfig({ enabled: checked })}
+          className="scale-[0.6]"
+        />
+      </div>
+
+      {saveConfig.enabled && (
+        <div className="space-y-2 p-2 bg-blue-50/50 dark:bg-blue-900/20 rounded border border-blue-200 dark:border-blue-800">
+          {/* 자동 저장 옵션 */}
+          <div className="flex items-center justify-between">
+            <div className="space-y-0.5">
+              <Label className="text-[9px]">자동 저장</Label>
+              <p className="text-[8px] text-muted-foreground">
+                레이아웃에 없어도 저장
+              </p>
+            </div>
+            <Switch
+              checked={saveConfig.autoSave}
+              onCheckedChange={(checked) => updateSaveConfig({ autoSave: checked })}
+              className="scale-[0.6]"
+            />
+          </div>
+
+          {/* 대상 테이블 */}
+          <div className="space-y-1">
+            <Label className="text-[9px]">대상 테이블</Label>
+            <Select
+              value={saveConfig.targetTable}
+              onValueChange={(value) => {
+                updateSaveConfig({ targetTable: value, targetColumn: "" });
+              }}
+            >
+              <SelectTrigger className="h-6 text-[10px]">
+                <SelectValue placeholder="테이블 선택" />
+              </SelectTrigger>
+              <SelectContent>
+                {allTables.map((t) => (
+                  <SelectItem key={t.tableName} value={t.tableName} className="text-[10px]">
+                    {t.displayName || t.tableName}
+                  </SelectItem>
+                ))}
+              </SelectContent>
+            </Select>
+          </div>
+
+          {/* 대상 컬럼 */}
+          <div className="space-y-1">
+            <Label className="text-[9px]">대상 컬럼</Label>
+            <SourceColumnSelector
+              sourceTable={saveConfig.targetTable}
+              value={saveConfig.targetColumn}
+              onChange={(value) => updateSaveConfig({ targetColumn: value })}
+              placeholder="컬럼 선택"
+            />
+          </div>
+
+          {/* 조인 키 설정 */}
+          <div className="space-y-2">
+            <Label className="text-[9px]">조인 키</Label>
+            <div className="space-y-1.5">
+              <div className="space-y-0.5">
+                <span className="text-[8px] text-muted-foreground">카드 키 (현재 카드 데이터)</span>
+                <SourceColumnSelector
+                  sourceTable={sourceTable}
+                  value={saveConfig.joinKey?.sourceField || ""}
+                  onChange={(value) =>
+                    updateSaveConfig({
+                      joinKey: { ...saveConfig.joinKey, sourceField: value },
+                    })
+                  }
+                  placeholder="카드 키 선택"
+                />
+              </div>
+              <div className="flex justify-center">
+                <span className="text-[10px] text-muted-foreground">↓</span>
+              </div>
+              <div className="space-y-0.5">
+                <span className="text-[8px] text-muted-foreground">대상 키 (업데이트할 레코드 식별)</span>
+                <SourceColumnSelector
+                  sourceTable={saveConfig.targetTable}
+                  value={saveConfig.joinKey?.targetField || ""}
+                  onChange={(value) =>
+                    updateSaveConfig({
+                      joinKey: { ...saveConfig.joinKey, targetField: value },
+                    })
+                  }
+                  placeholder="대상 키 선택"
+                />
+              </div>
+            </div>
+          </div>
+
+          {/* 설정 요약 */}
+          {saveConfig.targetTable && saveConfig.targetColumn && (
+            <div className="p-1.5 bg-white/50 dark:bg-black/20 rounded text-[9px] space-y-1">
+              <div>
+                <span className="font-medium">저장 경로:</span>
+                {saveConfig.autoSave && (
+                  <Badge variant="secondary" className="ml-1 text-[8px] px-1 py-0">
+                    자동
+                  </Badge>
+                )}
+              </div>
+              <div className="font-mono text-blue-600 dark:text-blue-400 break-all">
+                {saveConfig.targetTable}.{saveConfig.targetColumn}
+              </div>
+              {saveConfig.joinKey?.sourceField && saveConfig.joinKey?.targetField && (
+                <div className="text-[8px] text-muted-foreground">
+                  조인: {saveConfig.joinKey.sourceField} → {saveConfig.joinKey.targetField}
+                </div>
+              )}
+            </div>
+          )}
+        </div>
+      )}
     </div>
   );
 }