Merge vllmScripts under llm/ (history-preserving import)

The vllmScripts repository (LLM inference fleet: serve scripts, systemd
units, env tunables, deployment runbook, research docs) is merged into
this repository. Its full history is grafted under llm/ with a
two-parent merge commit so no commit is lost.

A follow-up commit reorganizes llm/ into the repo layout:
llm/docs -> docs/LLM, llm/scripts -> scripts, llm/old -> old.

llm/docs/ling-3.0-flash-vllm-plan.md

@@ -0,0 +1,10 @@
+# Ling-3.0-flash on Dankclaw — vLLM-ROCm Deployment Plan (never shipped)
+
+This page was the plan for a vLLM-ROCm deployment of
+`jcbtc/Ling-3.0-Flash-CIRU-int4-Strix-native` (INT4 W4A16, ~62 GB) on
+Dankclaw. The deployment never shipped. The actual Ling work used the
+llama.cpp Q6_K fork trial instead: [[ling-3.0-flash-trial]].
+
+The trial service (`frank-large-ling`) is retired and disabled under the
+boot policy (2026-08-17). `frank-default-large` is the Qwen3.8-27B PP
+head, not the Ling path. See git history for the full decision table.