Example echobot.py is broken (ImportError: cannot import name 'MsgData' from 'deltachat2')

Following the steps from this repository resulted in the following error message:

```
$ python ./echobot.py init DCACCOUNT:https://nine.testrun.org/new

Traceback (most recent call last):
File "/root/deltachat-bot/./echobot.py", line 5, in
from deltachat2 import MsgData, events
ImportError: cannot import name 'MsgData' from 'deltachat2' (/root/user/.venv/lib/python3.13/site-packages/deltachat2/__init__.py)
```

Looking into the repository of the [Python library](https://github.com/deltachat-bot/deltabot-cli-py/tree/main) shows that the code has to be changed:

Working version of echobot.py:
```python3
#!/usr/bin/env python3
from deltachat2 import MessageData, events
from deltabot_cli import BotCli

cli = BotCli("echobot")

@cli.on(events.RawEvent)
def log_event(bot, accid, event):
bot.logger.info(event)

@cli.on(events.NewMessage)
def echo(bot, accid, event):
msg = event.msg
bot.rpc.send_msg(accid, msg.chat_id, MessageData(text=msg.text))

if __name__ == "__main__":
cli.start()
```

Open echobot.py and compare its deltachat2 imports and message construction with the current Python library API referenced in the issue. Run the documented python ./echobot.py init command afterward to verify that the example starts without the ImportError and retains its echo behavior.

Written by the indexing model from the issue text.