History Polling: Message-ID-basiert, neuer /api/history/poll Endpoint

wwwroot/js/api.js

@@ -12,3 +12,8 @@ async function apiHistory(sessionId = 'null', limit = 50) {
   const resp = await fetch(`/api/history?sessionId=${sessionId}&limit=${limit}`);
   return resp.json();
 }
+
+async function apiHistoryPoll(afterId) {
+  const resp = await fetch(`/api/history/poll?afterId=${afterId}`);
+  return resp.json();
+}