feat(items): 일괄 상시 판매 전환 버튼 + 목록 상시/미노출 배지 강조

- bulk-sale-range API: alwaysSale 모드 추가 — 선택 품목들을 is_always_sale='Y'
  로 설정하면서 날짜는 모두 NULL 로 초기화.
- 품목 관리 일괄 패널: [상시 판매로 설정] 버튼 추가. 안내 문구도 갱신
  (상시=항상 노출/날짜 초기화, 해제=미노출/날짜 초기화).
- 목록 판매기간 컬럼: 상시(초록 배지)/날짜범위/미노출(빨강 배지) 3종 명확 표시.

src/app/(main)/m/admin/items/page.tsx

@@ -335,12 +335,14 @@ export default function AdminItemsPage() {
                       {fmt(it.STOCK_QTY)}
                     </span>
                   </td>
-                  <td className="px-3 py-2 text-center text-[11px] tabular-nums text-slate-600 whitespace-nowrap">
-                    {it.SALE_START_DATE || it.SALE_END_DATE
-                      ? <>{it.SALE_START_DATE ?? "—"} <span className="text-slate-300">~</span> {it.SALE_END_DATE ?? "—"}</>
-                      : it.IS_ALWAYS_SALE === "Y"
-                        ? <span className="text-emerald-700 font-bold">상시</span>
-                        : <span className="text-rose-500">미노출</span>}
+                  <td className="px-3 py-2 text-center text-[11px] tabular-nums whitespace-nowrap">
+                    {it.IS_ALWAYS_SALE === "Y" ? (
+                      <span className="inline-block px-2 py-0.5 rounded bg-emerald-100 text-emerald-700 font-bold">상시</span>
+                    ) : (it.SALE_START_DATE || it.SALE_END_DATE) ? (
+                      <span className="text-slate-600">{it.SALE_START_DATE ?? "—"} <span className="text-slate-300">~</span> {it.SALE_END_DATE ?? "—"}</span>
+                    ) : (
+                      <span className="inline-block px-2 py-0.5 rounded bg-rose-100 text-rose-600 font-bold">미노출</span>
+                    )}
                   </td>
                   <td className="px-3 py-2 text-center">
                     {it.IS_HIDDEN === "Y" && (
@@ -693,12 +695,12 @@ function BulkSaleRangeBar({
   const [to, setTo] = useState("");
   const [busy, setBusy] = useState(false);
 
-  const apply = async (clear: boolean) => {
+  const apply = async (mode: "apply" | "clear" | "always") => {
     if (selectedIds.size === 0) {
       Swal.fire({ icon: "warning", title: "품목을 선택하세요" });
       return;
     }
-    if (!clear && !from && !to) {
+    if (mode === "apply" && !from && !to) {
       Swal.fire({ icon: "warning", title: "시작일 또는 종료일을 입력하세요" });
       return;
     }
@@ -711,14 +713,18 @@ function BulkSaleRangeBar({
           objids: Array.from(selectedIds),
           saleStartDate: from || null,
           saleEndDate: to || null,
-          clear,
+          clear: mode === "clear",
+          alwaysSale: mode === "always",
         }),
       });
       const j = await res.json();
       if (j.success) {
+        const title = mode === "clear" ? "미노출 처리됨"
+                    : mode === "always" ? "상시 판매로 설정됨"
+                    : "판매기간 일괄 적용 완료";
         Swal.fire({
           icon: "success",
-          title: clear ? "판매기간 해제됨" : "판매기간 일괄 적용 완료",
+          title,
           text: `${j.count}개 품목 적용`,
           timer: 1500,
           showConfirmButton: false,
@@ -754,11 +760,11 @@ function BulkSaleRangeBar({
           className="h-9 px-2 rounded-md border border-emerald-300 text-sm bg-white"
         />
       </div>
-      <div className="flex items-center gap-2">
+      <div className="flex items-center gap-2 flex-wrap">
         <button
           type="button"
           disabled={busy}
-          onClick={() => apply(false)}
+          onClick={() => apply("apply")}
           className="h-9 px-3 rounded-md bg-emerald-700 text-white text-sm font-bold hover:bg-emerald-800 disabled:opacity-50"
         >
           선택 {selectedIds.size}건 일괄 적용
@@ -766,14 +772,23 @@ function BulkSaleRangeBar({
         <button
           type="button"
           disabled={busy}
-          onClick={() => apply(true)}
+          onClick={() => apply("always")}
+          className="h-9 px-3 rounded-md bg-emerald-600 text-white text-sm font-bold hover:bg-emerald-700 disabled:opacity-50"
+          title="선택한 품목을 상시 판매로 설정 (날짜는 모두 초기화)"
+        >
+          상시 판매로 설정
+        </button>
+        <button
+          type="button"
+          disabled={busy}
+          onClick={() => apply("clear")}
           className="h-9 px-3 rounded-md bg-white border border-emerald-300 text-emerald-700 text-sm font-semibold hover:bg-emerald-100 disabled:opacity-50"
         >
           판매기간 해제
         </button>
       </div>
       <div className="text-[11px] text-emerald-700/80 ml-auto">
-        체크된 품목에 일괄 적용됩니다 (해제 = 상시 판매)
+        체크된 품목에 일괄 적용 · <b>상시</b>=항상 노출(날짜 초기화) · <b>해제</b>=미노출(날짜 초기화)
       </div>
     </div>
   );

src/app/api/m/items/bulk-sale-range/route.ts

@@ -8,26 +8,32 @@ export async function POST(req: NextRequest) {
   const g = await requireMomoAdmin();
   if (g instanceof NextResponse) return g;
 
-  const { objids, saleStartDate, saleEndDate, clear } = await req.json() as {
-    objids: string[]; saleStartDate?: string; saleEndDate?: string; clear?: boolean;
+  const { objids, saleStartDate, saleEndDate, clear, alwaysSale } = await req.json() as {
+    objids: string[]; saleStartDate?: string; saleEndDate?: string; clear?: boolean; alwaysSale?: boolean;
   };
   if (!Array.isArray(objids) || objids.length === 0) {
     return NextResponse.json({ success: false, message: "대상 품목을 선택하세요." }, { status: 400 });
   }
 
   const userId = g.user.objid || g.user.userId;
-  const start = clear ? null : (saleStartDate || null);
-  const end   = clear ? null : (saleEndDate   || null);
+  // 모드:
+  //   alwaysSale=true → 상시 판매로 전환: is_always_sale='Y', 날짜 모두 초기화
+  //   clear=true     → 미노출로 전환: is_always_sale='N', 날짜 모두 초기화
+  //   기본          → 날짜 적용: is_always_sale='N', 날짜 입력 그대로
+  const flag = alwaysSale ? "Y" : "N";
+  const start = (alwaysSale || clear) ? null : (saleStartDate || null);
+  const end   = (alwaysSale || clear) ? null : (saleEndDate   || null);
 
   const placeholders = objids.map((_, i) => `$${i + 1}`).join(",");
   const res = await pool.query(
     `UPDATE momo_items
         SET sale_start_date = $${objids.length + 1}::timestamp,
             sale_end_date   = $${objids.length + 2}::timestamp,
+            is_always_sale  = $${objids.length + 4},
             update_date = NOW(),
             update_id = $${objids.length + 3}
       WHERE objid IN (${placeholders})`,
-    [...objids, start, end, userId]
+    [...objids, start, end, userId, flag]
   );
 
   // 일괄 적용한 판매 일정이 유효(오늘/미래)한 품목이 있으면 일반 사용자에게 알림.
@@ -37,13 +43,16 @@ export async function POST(req: NextRequest) {
       const sell = await pool.query<{ item_name: string; start_txt: string | null; orderable_now: boolean }>(
         `SELECT item_name,
                 TO_CHAR(sale_start_date,'YYYY-MM-DD HH24:MI') AS start_txt,
-                (sale_start_date IS NULL OR (NOW() AT TIME ZONE 'Asia/Seoul') >= sale_start_date) AS orderable_now
+                (COALESCE(is_always_sale,'N')='Y' OR sale_start_date IS NULL OR (NOW() AT TIME ZONE 'Asia/Seoul') >= sale_start_date) AS orderable_now
            FROM momo_items
           WHERE objid IN (${placeholders})
             AND COALESCE(is_del,'N') != 'Y'
             AND UPPER(COALESCE(status,'')) = 'ACTIVE'
             AND COALESCE(is_hidden,'N') != 'Y'
-            AND (sale_start_date IS NOT NULL OR sale_end_date IS NOT NULL)
+            AND (
+              COALESCE(is_always_sale,'N') = 'Y'
+              OR (
+                (sale_start_date IS NOT NULL OR sale_end_date IS NOT NULL)
                 AND (
                   sale_end_date IS NULL
                   OR (NOW() AT TIME ZONE 'Asia/Seoul') <= CASE
@@ -51,6 +60,8 @@ export async function POST(req: NextRequest) {
                       THEN sale_end_date + INTERVAL '1 day' - INTERVAL '1 second'
                     ELSE sale_end_date
                   END
+                )
+              )
             )`,
         objids
       );