fix(dual_camera_system): 将PTZ相机通道号从1改为0

SDK的通道号从0开始计数，原配置错误导致控制异常

dual_camera_system/config/camera.py

@@ -28,7 +28,7 @@ PTZ_CAMERA = {
     'rtsp_port': 554,
     'username': 'admin',
     'password': 'Aa1234567',
-    'channel': 1,
+    'channel': 0,  # PTZ 控制通道号 (SDK 从 0 开始)
     'rtsp_url': 'rtsp://admin:Aa1234567@192.168.20.197:554/cam/realmonitor?channel=1&subtype=1',
 }