Add subscription info refresh endpoint and UI stats

src/server/subscription.js

@@ -136,7 +136,7 @@ export function parseSubscriptionBody(body) {
   return { config: parsedConfig, servers };
 }
 
-export async function fetchSubscription(url) {
+async function requestSubscription(url) {
   let parsedUrl;
   try {
     parsedUrl = new URL(url);
@@ -157,6 +157,21 @@ export async function fetchSubscription(url) {
     throw new Error(`Subscription request failed: HTTP ${response.status}`);
   }
 
+  return response;
+}
+
+export async function fetchSubscriptionInfo(url) {
+  const response = await requestSubscription(url);
+  await response.body?.cancel();
+  return {
+    userInfo: parseUserInfo(response.headers.get('subscription-userinfo')),
+    fetchedAt: new Date().toISOString(),
+  };
+}
+
+export async function fetchSubscription(url) {
+  const response = await requestSubscription(url);
+
   const body = await response.text();
   const userInfo = parseUserInfo(response.headers.get('subscription-userinfo'));
   const parsed = parseSubscriptionBody(body);