重构UCD模块

app/device/connection.py

@@ -65,7 +65,7 @@ class ConnectionController:
     def list_ucd_devices(self) -> list[str]:
         """返回 SDK 给出的设备显示字符串列表。"""
         try:
-            return self._device.raw_controller.search_device() or []
+            return self._device.search_devices()
         except Exception as exc:  # noqa: BLE001
             self._log(f"枚举 UCD 设备失败: {exc}", level="error")
             return []
@@ -103,11 +103,6 @@ class ConnectionController:
             self._device.close()
         except Exception:  # noqa: BLE001
             pass
-        # 旧 controller.status 也要清零，兼容仍读取它的代码
-        try:
-            self._app.ucd.status = False
-        except Exception:  # noqa: BLE001
-            pass
         self._log("UCD连接已断开", level="info")
 
     # -- CA 连接 -------------------------------------------------
@@ -347,7 +342,7 @@ def update_connection_indicator(self: "PQAutomationApp", indicator, connected):
 def refresh_connection_indicators(self: "PQAutomationApp"):
     """根据当前设备状态重画 UCD / CA 指示灯。"""
     if hasattr(self, "ucd_status_indicator"):
-        ucd_connected = bool(getattr(self.ucd, "status", False))
+        ucd_connected = self.signal_service.is_connected
         _draw_connection_indicator(
             self.ucd_status_indicator,
             "green" if ucd_connected else "gray",