refactor: reorganize backend module boundaries

app/adapters/system/display.py

@@ -0,0 +1,29 @@
+from pyvirtualdisplay import Display
+
+from app.runtime.log import logger
+from app.foundation.singleton import Singleton
+from app.adapters.system.host import SystemUtils
+
+import os
+
+
+class DisplayHelper(metaclass=Singleton):
+    """在容器环境中管理浏览器所需的虚拟显示。"""
+
+    def __init__(self):
+        """仅在 Docker 内启动虚拟显示服务。"""
+        self._display = None
+        if not SystemUtils.is_docker():
+            return
+        try:
+            self._display = Display(visible=False, size=(1024, 768), extra_args=[os.environ['DISPLAY']])
+            self._display.start()
+        except Exception as err:
+            logger.error(f"DisplayHelper init error: {str(err)}")
+
+    def stop(self):
+        """停止已经启动的虚拟显示服务。"""
+        if self._display:
+            logger.info("正在停止虚拟显示...")
+            self._display.stop()
+            logger.info("虚拟显示已停止")