fix: add 1024px icon for 512x512@2x slot

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

Author: yibie

SkillsManager/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -55,7 +55,7 @@
       "size" : "512x512"
     },
     {
-      "filename" : "icon_512.png",
+      "filename" : "icon_1024.png",
       "idiom" : "mac",
       "scale" : "2x",
       "size" : "512x512"