feat(dashboard): upgrade promotion

public/locales/en-US/dashboard.json

@@ -1587,7 +1587,9 @@
     "sso": "SSO single sign-on",
     "more": "......",
     "later": "Maybe later",
-    "learnMore": "Learn more"
+    "learnMore": "Learn more",
+    "promotionTitle": "Community edition upgrade special discount",
+    "promotion": "Use the promotion code <0>{{code}}</0> when purchasing to apply a <1>-{{discount}}%</1> discount."
   },
   "abuseReport": {
     "deleteXAbuseReports": "Delete {{num}} abuse reports",

public/locales/ja-JP/dashboard.json

@@ -1574,7 +1574,9 @@
     "sso": "SSOシングルサインオン",
     "more": "......",
     "later": "後で",
-    "learnMore": "Pro版の詳細を見る"
+    "learnMore": "Pro版の詳細を見る",
+    "promotionTitle": "コミュニティ版アップグレード特別割引",
+    "promotion": "購入時に<0>{{code}}</0>を使用すると、<1>-{{discount}}%</1>の割引が適用されます。"
   },
   "abuseReport": {
     "deleteXAbuseReports": "{{num}} 個の舉報を削除",

public/locales/zh-CN/dashboard.json

@@ -1573,7 +1573,9 @@
     "sso": "SSO 单点登录",
     "more": "......",
     "later": "稍后再说",
-    "learnMore": "了解 Pro 版本详情"
+    "learnMore": "了解 Pro 版本详情",
+    "promotionTitle": "社区版升级特别优惠",
+    "promotion": "购买时使用优惠码 <0>{{code}}</0>，获得 <1>-{{discount}}%</1> 折扣。"
   },
   "abuseReport": {
     "deleteXAbuseReports": "删除 {{num}} 个举报",

public/locales/zh-TW/dashboard.json

@@ -1570,7 +1570,9 @@
     "sso": "SSO 單點登入",
     "more": "......",
     "later": "稍後再說",
-    "learnMore": "了解 Pro 版本詳情"
+    "learnMore": "了解 Pro 版本詳情",
+    "promotionTitle": "社區版升級特別優惠",
+    "promotion": "購買時使用優惠碼 <0>{{code}}</0>，獲得 <1>-{{discount}}%</1> 折扣。"
   },
   "abuseReport": {
     "deleteXAbuseReports": "刪除 {{num}} 個舉報",

src/component/Admin/Common/ProDialog.tsx

@@ -1,8 +1,22 @@
-import { Button, DialogContent, List, ListItem, ListItemIcon, ListItemText, Typography, styled } from "@mui/material";
-import { useCallback } from "react";
-import { useTranslation } from "react-i18next";
+import {
+  Alert,
+  AlertTitle,
+  Button,
+  DialogContent,
+  List,
+  ListItem,
+  ListItemIcon,
+  ListItemText,
+  Typography,
+  styled,
+} from "@mui/material";
+import dayjs from "dayjs";
+import { useCallback, useMemo } from "react";
+import { Trans, useTranslation } from "react-i18next";
 import DraggableDialog, { StyledDialogActions } from "../../Dialogs/DraggableDialog";
 import CheckmarkCircleFilled from "../../Icons/CheckmarkCircleFilled";
+import Gift from "../../Icons/Gift";
+import { Code } from "./Code";
 
 export interface ProDialogProps {
   open: boolean;
@@ -28,12 +42,24 @@ const StyledButton = styled(Button)(({ theme }) => ({
   transition: "all 300ms cubic-bezier(0.4, 0, 0.2, 1) !important",
 }));
 
+// TODO: fetch from cloudreve.org
+const currentPromotion = {
+  code: "FI5Q9668YV",
+  discount: 15,
+  start: "2025-08-12T00:00:00Z",
+  end: "2025-10-12T23:59:59Z",
+};
+
 const ProDialog = ({ open, onClose }: ProDialogProps) => {
   const { t } = useTranslation("dashboard");
   const openMore = useCallback((e: React.MouseEvent<HTMLButtonElement>) => {
     e.stopPropagation();
     window.open("https://cloudreve.org/pro", "_blank");
   }, []);
+  const showPromotion = useMemo(() => {
+    const now = dayjs();
+    return now >= dayjs(currentPromotion.start) && now <= dayjs(currentPromotion.end);
+  }, []);
   return (
     <DraggableDialog
       title={t("pro.title")}
@@ -76,6 +102,25 @@ const ProDialog = ({ open, onClose }: ProDialogProps) => {
             </ListItem>
           ))}
         </List>
+        {showPromotion && (
+          <Alert
+            iconMapping={{
+              info: <Gift fontSize="inherit" />,
+            }}
+            severity="info"
+            sx={{ mt: 2 }}
+          >
+            <AlertTitle>{t("pro.promotionTitle")}</AlertTitle>
+            <Trans
+              i18nKey="dashboard:pro.promotion"
+              values={{
+                code: currentPromotion.code,
+                discount: currentPromotion.discount,
+              }}
+              components={[<Code />, <Typography component={"span"} fontWeight={600} />]}
+            />
+          </Alert>
+        )}
       </DialogContent>
       <StyledDialogActions
         sx={{