Convert to cargo workspace with lib/ and cli/ crates. Add Nix flake
for building and development. Extract handle_urb_loop and add
read_urb_command to the library for CLI consumption.
Implement the usbip-rs CLI binary with clap subcommands:
- client listen: accept incoming connections via vhci_hcd sysfs
- host connect: passthrough real USB devices via nusb
- test_hid connect: export a simulated HID keyboard for testing
Add vsock transport layer and vhci_hcd sysfs interaction module.
Apply rustfmt formatting project-wide and add rustfmt/clippy to devShell.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
