[fix] pre and cdn swith

src/app/(main)/preference/general/page.tsx

@@ -64,10 +64,23 @@ export default function Page() {
                 ? "检查更新时会包含预发布版本（beta、alpha等）"
                 : "仅检查正式版本"}
             </p>
+            <Switch
+              isSelected={app.state.useCdn}
+              size="sm"
+              onChange={(e) => app.setUseCdn(e.target.checked)}
+            >
+              使用 CDN 加速下载
+            </Switch>
+            <p className="text-xs text-zinc-500">
+              {app.state.useCdn
+                ? "加速下载，避免 GitHub 无法正常访问"
+                : "直接从 GitHub 下载更新文件"}
+            </p>
           </div>
           <UpdateChecker
             customEndpoint={customEndpoint || undefined}
             includePrerelease={app.state.includePrerelease}
+            useCdn={app.state.useCdn}
           />
         </div>