fix armor_detect

src/rm_auto_aim/armor_detector/src/light_corner_corrector.cpp

@@ -151,7 +151,7 @@ cv::Point2f LightCornerCorrector::findCorner(const cv::Mat &gray_img,
   std::vector<cv::Point2f> candidates;
 
   // Limit candidates for performance - use subsampling for wide lights
-  int n = std::max(1, light.width - 2);
+  int n = std::max(1, static_cast<int>(light.width) - 2);
   int stride = std::max(1, n / 5);  // Limit to ~5 samples regardless of width
   int half_n = std::round(n / 2);