Add serverchan3 support for serverchan notification provider (#5145)

Co-authored-by: Frank Elsinga <frank@elsinga.de>

server/notification-providers/serverchan.js

@@ -11,8 +11,13 @@ class ServerChan extends NotificationProvider {
     async send(notification, msg, monitorJSON = null, heartbeatJSON = null) {
         const okMsg = "Sent Successfully.";
 
+        // serverchan3 requires sending via ft07.com
+        const url = String(notification.serverChanSendKey).startsWith("sctp")
+            ? `https://${notification.serverChanSendKey}.push.ft07.com/send`
+            : `https://sctapi.ftqq.com/${notification.serverChanSendKey}.send`;
+
         try {
-            await axios.post(`https://sctapi.ftqq.com/${notification.serverChanSendKey}.send`, {
+            await axios.post(url, {
                 "title": this.checkStatus(heartbeatJSON, monitorJSON),
                 "desp": msg,
             });