Fix OpenClaw: auto-include gateway token in dashboard link

dashboard/backend/routers/system.py

@@ -5,7 +5,7 @@ import platform
 import time
 import httpx
 from fastapi import APIRouter, Query
-from config import TELEGRAM_BOT_TOKEN, TELEGRAM_CHAT_ID, VOLUME_ROOT
+from config import TELEGRAM_BOT_TOKEN, TELEGRAM_CHAT_ID, VOLUME_ROOT, OPENCLAW_GATEWAY_TOKEN
 
 router = APIRouter()
 
@@ -110,3 +110,8 @@ def _classify(method, path, status, user):
         return "noise"
     # Info — everything else
     return "info"
+
+
+@router.get("/openclaw-token")
+def openclaw_token():
+    return {"token": OPENCLAW_GATEWAY_TOKEN}