Telegram notification
1. Get bot API token
Create a Telegram account, then open @BotFather and send /newbot. Set the bot name and username; BotFather returns an API Token.

2. Get chat ID
Use @RawDataBot in Telegram: start a chat and it will show your Chat ID.

3. Configure the provider in Casdoor
Create a Notification provider, set Type to Telegram, and fill in:
| Casdoor field | Value |
|---|---|
| Secret key | API Token |
| Chat ID | Chat ID |
| Content | Message template (optional) |
