Cannot add debug logging in production

When in debug mode, we can add logs with levels higher than error/warning. This works:
```python
current_app.logger.debug("this is a debug log")
```

However, when in "production" (`DEBUG` is `False`), Flask will not change the level of the root logger, see [here](https://github.com/pallets/flask/blob/90967ccb9ab1f757c2637a68ea2e16b8da2605f4/src/flask/logging.py#L71). As a consequence, any log higher than `.error` or `.warning` will not propagate to the specific handlers, so no logging output.

To test this, setting `app.logger.setLevel(logging.DEBUG)` fixes `current_app.logger.debug`.

The [Flask documentation](https://flask.palletsprojects.com/en/2.3.x/logging/#basic-configuration) suggests setting the logging level before app initialization using `from logging.config import dictConfig`.

Start by reproducing the production behavior with current_app.logger.debug and app.logger.setLevel(logging.DEBUG), then inspect Flask's linked logging.py location and the dictConfig guidance. The issue does not specify the desired change; done should include an agreed production logging behavior and verification that debug output follows it.

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