优化ucd调用结构

app/ucd/__init__.py

@@ -0,0 +1,28 @@
+"""UCD 信号发生器 — domain / enum / device / service。
+
+GUI 与测试代码通常只需::
+
+    from app.ucd import SignalService, UCD323Device, EventBus
+"""
+from app.ucd.domain import *  # noqa: F403
+from app.ucd.enum import UCDEnum
+from app.ucd.device import (
+    DeviceInfo,
+    IUcdDevice,
+    UCD323Device,
+    list_devices,
+)
+from app.ucd.service import PatternService, PatternSession, SignalService
+
+__all__ = [
+    "SignalService",
+    "PatternService",
+    "PatternSession",
+    "UCD323Device",
+    "IUcdDevice",
+    "DeviceInfo",
+    "UCDEnum",
+    "EventBus",
+    "ConnectionChanged",
+    "DeviceKind",
+]