Implement real Jupyter backend with jupyter-client

- Replaced mock exec() implementation with real Jupyter protocol
- Uses jupyter-client (host) to connect to ipykernel (container) via ZMQ
- 1:1 mapping: one container per session, one kernel per container
- Proper Jupyter message protocol for code execution
- Kernel lifecycle management (start, execute, shutdown, restart)
- Namespace inspection via introspection code
- Idle kernel cleanup
- Connection file management
- Backed up old implementation as kernel_old.py

TODO:
- Container image needs ipykernel installed
- Need to implement proper port mapping for ZMQ
- Need to mount connection file into container
- Add better kernel readiness check
- Implement restart_kernel properly with KernelManager
- Write tests

uv.lock

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