Fix WebSocket URL: use websocketUrl config field instead of baseUrl

Agent-Logs-Url: https://github.com/MineplayMC/atlas-web/sessions/ac5b7cdc-b5dd-46b4-88c4-e62b862af99f

Co-authored-by: OmeWillem <94999824+OmeWillem@users.noreply.github.com>

Author: Copilot

src/server/routes/atlas.route.ts

@@ -654,7 +654,7 @@ const getWebSocketToken = os
     return {
       token: tokenResponse.data.token,
       expiresAt: tokenResponse.data.expiresAt,
-      wsUrl: `${configManager.getAtlasConfig()?.baseUrl!.replace(/^http/, "ws")}/api/v1/servers/${serverId}/ws`,
+      wsUrl: `${configManager.getAtlasConfig()?.websocketUrl}/api/v1/servers/${serverId}/ws`,
     };
   });