Reorganize: llm/scripts -> scripts (LLM serve scripts, units, env tunables)

The LLM fleet serve scripts, systemd units, env tunables, and bench
harnesses join the deploy scripts. The vllmScripts deploy.sh is
removed here; its functionality is folded into the unified
scripts/deploy.sh in a follow-up commit.

bench-spec-stack.sh gains the executable bit (required by the
scripts_syntax test seam).

scripts/frank-default-npu.service

@@ -0,0 +1,17 @@
+[Unit]
+Description=FastFlowLM NPU inference (frank-default-npu) on Dankclaw
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+User=dank
+Group=dank
+Environment="FLM_NPU_ENV_FILE=/home/dank/vllmScripts/scripts/frank-default-npu.env"
+ExecStart=/home/dank/vllmScripts/scripts/serve-frank-default-npu.sh
+LimitMEMLOCK=infinity
+Restart=on-failure
+RestartSec=10
+
+[Install]
+WantedBy=multi-user.target