feat(streamProxy): StreamProxy增加cameraCode字段

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/main/java/com/genersoft/iot/vmp/streamProxy/bean/StreamProxy.java

@@ -30,6 +30,9 @@ public class StreamProxy extends CommonGBChannel {
     @Schema(description = "流ID")
     private String stream;
 
+    @Schema(description = "摄像头全局唯一编码（格式：cam_xxxxxxxxxxxx）")
+    private String cameraCode;
+
     @Schema(description = "当前拉流使用的流媒体服务ID")
     private String mediaServerId;