fix: 修复 RunMulti 中 Mat 所有权语义不明确导致的潜在 Dispose 问题 (#2730)

BetterGenshinImpact/Core/Recognition/OCR/Paddle/Rec.cs

@@ -95,7 +95,10 @@ public class Rec(
                 // .AsParallel()
                 .Select(src =>
                 {
-                    using var channel3 = src.Channels() switch
+                    Mat? channel3 = default;
+                    try
+                    {
+                        channel3 = src.Channels() switch
                         {
                             4 => src.CvtColor(ColorConversionCodes.BGRA2BGR),
                             1 => src.CvtColor(ColorConversionCodes.GRAY2BGR),
@@ -110,6 +113,15 @@ public class Rec(
                         }
 
                         return result;
+                    }
+                    finally
+                    {
+                        // Only dispose Mats created in this scope
+                        if (channel3 != null && !ReferenceEquals(channel3, src))
+                        {
+                            channel3.Dispose();
+                        }
+                    }
                 })
                 .Select(inputTensor =>
                     {