feat(ift): EventHub AI Router stack for Zed

FastAPI gateway with A/B/C lane orchestration, LiteLLM proxy config,
Swarm stack (postgres, redis, VPN off-by-default), deploy/smoke/audit scripts.

scripts/vendor-litellm-dashboards.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+# Vendor LiteLLM official Grafana dashboard JSON into EventHubDevOps
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+LITELLM_REF="${LITELLM_REF:-main-v1.96.0-stable}"
+DEVOPS="${DEVOPS_ROOT:-$(cd "$ROOT/../EventHubDevOps" 2>/dev/null && pwd || echo "")}"
+
+if [[ -z "$DEVOPS" || ! -d "$DEVOPS/ift/observability" ]]; then
+  echo "DEVOPS_ROOT not found — set to EventHubDevOps path" >&2
+  exit 1
+fi
+
+DEST="${DEVOPS}/ift/observability/grafana/dashboards/litellm"
+mkdir -p "$DEST"
+
+BASE="https://raw.githubusercontent.com/BerriAI/litellm/${LITELLM_REF}/cookbook/litellm_proxy_server/grafana_dashboard"
+
+fetch() {
+  local src="$1" dst="$2"
+  echo "Fetching $src"
+  curl -fsSL "${BASE}/${src}" -o "${DEST}/${dst}"
+}
+
+fetch "dashboard_v2/grafana_dashboard.json" "litellm-v2.json"
+fetch "dashboard_1/grafana_dashboard.json" "litellm-v1.json" || true
+
+if command -v jq >/dev/null 2>&1; then
+  for f in litellm-v2.json litellm-v1.json; do
+    [[ -f "${DEST}/${f}" ]] || continue
+    jq 'walk(if type=="object" and has("datasource") then .datasource="prometheus" else . end)' \
+      "${DEST}/${f}" > "${DEST}/${f}.tmp" && mv "${DEST}/${f}.tmp" "${DEST}/${f}"
+  done
+fi
+
+echo "Dashboards written to ${DEST}"