feat(settings): schedule picker, toggle placement, sub-theme docs link

- Replace the Telegram "Notification Time" free-text field with a guided
  cron builder: @every + number + unit (s/m/h), the @hourly/@daily/@weekly/
  @monthly macros, and a Custom option that seeds a valid 6-field crontab
  (cron runs with seconds enabled) as an escape hatch.
- Move "Restart Xray After Auto Disable" from the External Traffic tab to
  Panel Settings, where it belongs.
- Add a "Template guide" link to the Sub Theme Directory setting pointing at
  docs/custom-subscription-templates.md.
- Localize all new strings across every locale.

frontend/src/pages/settings/GeneralTab.tsx

@@ -210,6 +210,11 @@ export default function GeneralTab({ allSetting, updateSetting }: GeneralTabProp
                 onChange={(v) => updateSetting({ pageSize: Number(v) || 0 })} />
             </SettingListItem>
 
+            <SettingListItem paddings="small" title={t('pages.settings.restartXrayOnClientDisable')} description={t('pages.settings.restartXrayOnClientDisableDesc')}>
+              <Switch checked={allSetting.restartXrayOnClientDisable}
+                onChange={(v) => updateSetting({ restartXrayOnClientDisable: v })} />
+            </SettingListItem>
+
             <SettingListItem paddings="small" title={t('pages.settings.language')}>
               <Select
                 value={lang}
@@ -267,10 +272,6 @@ export default function GeneralTab({ allSetting, updateSetting }: GeneralTabProp
                 onChange={(e) => updateSetting({ externalTrafficInformURI: e.target.value })}
               />
             </SettingListItem>
-            <SettingListItem paddings="small" title={t('pages.settings.restartXrayOnClientDisable')} description={t('pages.settings.restartXrayOnClientDisableDesc')}>
-              <Switch checked={allSetting.restartXrayOnClientDisable}
-                onChange={(v) => updateSetting({ restartXrayOnClientDisable: v })} />
-            </SettingListItem>
           </>
         ),
       },