fix(smp_coder):拍照脚本优化

- 新增检查临时文件夹中的图片文件是否存在
- 如果存在，则删除旧的图片文件
- 优化了脚本的可读性和健壮性

smp_coder/camera.sh

@@ -1,4 +1,16 @@
 #!/usr/bin/bash
 
+IMAGE_PATH="/tmp/image.jpg"
+
+if [ -f "$IMAGE_PATH" ]; then
+    echo "Image already exists at $IMAGE_PATH"
+    if sudo rm "$IMAGE_PATH"; then
+        echo "Successfully deleted $IMAGE_PATH"
+    else
+        echo "Failed to delete $IMAGE_PATH"
+        exit 1
+    fi
+fi
+
 
 fswebcam -r 1280x720 --no-banner -S 20 /tmp/image.jpg