Add ATI Net F/T sensor node

[han-xudong]

Summary

• Add a sensors optional extra with pynetft
• Add an AtiFt sensor node for ATI Net F/T devices
• Publish force, torque, wrench, status, and sequence metadata
• Support startup and runtime bias requests
• Add a hardware-free unit test using a fake NetFT client

Testing

• uvx pre-commit run -a
• uv run --extra dev pytest -n 4
• uv run --extra dev --extra sensors python -c "from rio_hw.sensors import AtiFtClient; c=AtiFtClient('Thread', host='192.168.1.1', freq=10); print(type(c).__name__, c.freq)"