serve: default llama-server path is relative to the 1bit executable; fails in the installed layout (/opt/1bit-llama) #581

On the 1bit OS live stick (candidate 5, 26 Oct), 1bit serve -m <gguf> --device hrx run by hand fails with

1bit serve: Qwen3-0.6B-Q4_K_M on hrx (hrx/llama/bin/llama-server)
1bit serve: backend 0 did not become ready

because the default server path is hrx/llama/bin/llama-server relative to the executable's directory (/bin/1bit in the image, a symlink into the packed build tree), while the image ships the server at /opt/1bit-llama/llama-server (on PATH). --llama-server /opt/1bit-llama/llama-server works. scripts/lemonade-hrx has the ONEBIT_HRX_LLAMA_SERVER override, which the image now sets for Lemonade (#580), but 1bit serve itself does not read it.

Suggested: when the executable-relative default does not exist, fall back in order to $ONEBIT_HRX_LLAMA_SERVER, /opt/1bit-llama/llama-server, then llama-server on PATH, and say which one was taken in the "on hrx (...)" line. Found by the hardware live-USB gate; the VM gate never exercises --device hrx.

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