Consider renaming `intbot` folder to `server` and moving pyproject.toml there

This would allows us to put config of other tools that are run from inside intbot/ directory (like mypy, or pytest) in pyproject.toml. Currently looks like mypy/pytest are not checking for config one dir up.

Both client/ and deploy/ are independent from the server configuration.

It would also require updating Dockerfile, uv.lock location and some Makefile targets to fit the updated setup.

Low priority, something to think about in spare time.