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fix(vu): serialize VuSession socket I/O with a Mutex

Wrap UnixStream inside parking_lot::Mutex in VuSession so concurrent
vCPU config MMIO requests and worker-side vhost-user requests cannot
interleave frames on the socket.

Assisted-by: Antigravity:Gemini-4-Carbon
Signed-off-by: Changyuan Lyu <changyuanl@google.com>

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