中控版本探测响应增加 trading mode，供实例列表按 sim/live 排序展示。

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/hub/hub_bridge_register.py

@@ -397,6 +397,18 @@ def register_hub_bridge_routes(app: Flask, app_module: Any) -> None:
 
         ver = read_git_version()
         ver["online"] = True
+        mode = "live"
+        try:
+            from lib.sim.mode_lib import exchange_mode_label, is_sim_mode
+
+            get_db = getattr(app_module, "get_db", None)
+            if callable(get_db) and is_sim_mode(get_db):
+                mode = "sim"
+            ver["mode"] = mode
+            if callable(get_db):
+                ver["mode_label"] = exchange_mode_label(get_db=get_db, exchange_key="okx") or ""
+        except Exception:
+            ver["mode"] = mode
         return jsonify(ver)
 
     @app.route("/api/hub/update", methods=["POST"])