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/old/scripts/frank-default-large.service

@@ -0,0 +1,16 @@
+[Unit]
+Description=llama.cpp Qwen3.8-27B pipeline-parallel head (Strix + RPC to Dankserver) (frank-default-large)
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+User=dank
+Group=dank
+Environment="FRANK_PP_HEAD_ENV_FILE=/home/dank/vllmScripts/scripts/frank-default-large.env"
+ExecStart=/home/dank/vllmScripts/scripts/serve-pp-head.sh
+Restart=on-failure
+RestartSec=10
+
+[Install]
+WantedBy=multi-user.target