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/serve-frank-default-npu.sh

@@ -0,0 +1,49 @@
+#!/usr/bin/env bash
+# Serve the FastFlowLM (FLM) NPU endpoint — frank-default-npu.
+#
+# Runs flm serve with the model tag in frank-default-npu.env. The NPU
+# (XDNA2, 50 TOPS) is a single-lane device: generations serialize in FIFO
+# order, so this is a background/triage endpoint. The NPU shares the ~30 GiB
+# unified pool with frank-default-large (the CIRU llama.cpp service on the
+# iGPU); see docs/FastFlowLM NPU Inference.md for the memory budget.
+#
+# NOTE: FLM requires unlimited memlock. The unit sets LimitMEMLOCK=infinity.
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+ENV_FILE="${FLM_NPU_ENV_FILE:-$SCRIPT_DIR/frank-default-npu.env}"
+if [[ -f "$ENV_FILE" ]]; then
+    set -a
+    # shellcheck disable=SC1090
+    source "$ENV_FILE"
+    set +a
+fi
+
+# --- defaults (used when the env file does not set them) -------------------
+: "${FLM_BIN:=/usr/bin/flm}"
+: "${FLM_MODEL:=gemma4-it:e4b}"
+: "${FLM_HOST:=0.0.0.0}"
+: "${FLM_PORT:=52626}"
+: "${FLM_PMODE:=performance}"
+: "${FLM_ASR:=0}"
+: "${FLM_CTX_LEN:=-1}"
+
+if [[ ! -x "$FLM_BIN" ]]; then
+    echo "missing flm binary: $FLM_BIN" >&2
+    exit 1
+fi
+
+# --- optional flags ----------------------------------------------------------
+OPT_ARGS=()
+if [[ "${FLM_ASR}" != "0" ]]; then
+    OPT_ARGS+=(-a "${FLM_ASR}")
+fi
+if [[ "${FLM_CTX_LEN}" != "-1" ]]; then
+    OPT_ARGS+=(-c "${FLM_CTX_LEN}")
+fi
+
+exec "$FLM_BIN" serve "$FLM_MODEL" \
+    --host "$FLM_HOST" \
+    -p "$FLM_PORT" \
+    --pmode "$FLM_PMODE" \
+    "${OPT_ARGS[@]}"