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.env

@@ -0,0 +1,17 @@
+# Tunables for frank-default-npu (FastFlowLM NPU endpoint, Dankclaw)
+# Runtime: FLM 1.0.1 on the XDNA2 NPU (50 TOPS). Model: Gemma4-E4B-IT
+# (8B, Q4_1, vision + audio + reasoning). The NPU allocates from the
+# unified pool shared with frank-default-large (the CIRU llama.cpp
+# service on the iGPU). See docs/FastFlowLM NPU Inference.md.
+#
+# 2026-08-20: gemma4-it:e4b deployed. Footprint ~9.1 GB. 64k context.
+
+FLM_MODEL=gemma4-it:e4b
+FLM_HOST=0.0.0.0
+FLM_PORT=52626
+FLM_PMODE=performance
+FLM_ASR=0
+# 64K context (native max for gemma4-it is 32768, but NPU supports up to 256k).
+# The model's max_prefill_len is 4096, so prompts longer than that get
+# truncated at prefill time.
+FLM_CTX_LEN=65536