feat: add dedicated douyin workbench entry

scripts/status_douyin_workbench.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+set -eu
+
+PORT="${DOUYIN_WORKBENCH_PORT:-3618}"
+
+if ! lsof -nP -iTCP:"$PORT" -sTCP:LISTEN >/dev/null 2>&1; then
+  echo "douyin workbench stopped"
+  exit 1
+fi
+
+python3 - <<'PY'
+import os
+import urllib.request
+
+port = os.environ.get("PORT", "3618")
+for path in ("/workbench", "/"):
+    url = f"http://127.0.0.1:{port}{path}"
+    with urllib.request.urlopen(url, timeout=5) as resp:
+        print(f"{path}: {resp.status}")
+PY