feat: auto fetch upstream models (#2979)

* feat: add upstream model update detection with scheduled sync and manual apply flows

* feat: support upstream model removal sync and selectable deletes in update modal

* feat: add detect-only upstream updates and show compact +/- model badges

* feat: improve upstream model update UX

* feat: improve upstream model update UX

* fix: respect model_mapping in upstream update detection

* feat: improve upstream update modal to prevent missed add/remove actions

* feat: add admin upstream model update notifications with digest and truncation

* fix: avoid repeated partial-submit confirmation in upstream update modal

* feat: improve ui/ux

* feat: suppress upstream update alerts for unchanged channel-count within 24h

* fix: submit upstream update choices even when no models are selected

* feat: improve upstream model update flow and split frontend updater

* fix merge conflict

web/src/components/settings/PersonalSetting.jsx

@@ -86,6 +86,7 @@ const PersonalSetting = () => {
     gotifyUrl: '',
     gotifyToken: '',
     gotifyPriority: 5,
+    upstreamModelUpdateNotifyEnabled: false,
     acceptUnsetModelRatioModel: false,
     recordIpLog: false,
   });
@@ -158,6 +159,8 @@ const PersonalSetting = () => {
         gotifyToken: settings.gotify_token || '',
         gotifyPriority:
           settings.gotify_priority !== undefined ? settings.gotify_priority : 5,
+        upstreamModelUpdateNotifyEnabled:
+          settings.upstream_model_update_notify_enabled === true,
         acceptUnsetModelRatioModel:
           settings.accept_unset_model_ratio_model || false,
         recordIpLog: settings.record_ip_log || false,
@@ -426,6 +429,8 @@ const PersonalSetting = () => {
           const parsed = parseInt(notificationSettings.gotifyPriority);
           return isNaN(parsed) ? 5 : parsed;
         })(),
+        upstream_model_update_notify_enabled:
+          notificationSettings.upstreamModelUpdateNotifyEnabled === true,
         accept_unset_model_ratio_model:
           notificationSettings.acceptUnsetModelRatioModel,
         record_ip_log: notificationSettings.recordIpLog,

web/src/components/settings/personal/cards/NotificationSettings.jsx

@@ -58,6 +58,7 @@ const NotificationSettings = ({
   const formApiRef = useRef(null);
   const [statusState] = useContext(StatusContext);
   const [userState] = useContext(UserContext);
+  const isAdminOrRoot = (userState?.user?.role || 0) >= 10;
 
   // 左侧边栏设置相关状态
   const [sidebarLoading, setSidebarLoading] = useState(false);
@@ -470,6 +471,21 @@ const NotificationSettings = ({
                   ]}
                 />
 
+                {isAdminOrRoot && (
+                  <Form.Switch
+                    field='upstreamModelUpdateNotifyEnabled'
+                    label={t('接收上游模型更新通知')}
+                    checkedText={t('开')}
+                    uncheckedText={t('关')}
+                    onChange={(value) =>
+                      handleFormChange('upstreamModelUpdateNotifyEnabled', value)
+                    }
+                    extraText={t(
+                      '仅管理员可用。开启后，当系统定时检测全部渠道发现上游模型变更或检测异常时，将按你选择的通知方式发送汇总通知；渠道或模型过多时会自动省略部分明细。',
+                    )}
+                  />
+                )}
+
                 {/* 邮件通知设置 */}
                 {notificationSettings.warningType === 'email' && (
                   <Form.Input