chore(assets): add Kangkang AppIcon (light/dark/tinted, 16-1024) + SVG source

9 PNG sizes for iOS/macOS + dark + tinted variants. SVG design source under
docs/design/. Updates Contents.json to reference them.

Scheme reference 编码统一为 康康(Xcode 写入格式)。

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

@@ -1,85 +1,98 @@
 {
-  "images" : [
+  "images": [
     {
-      "idiom" : "universal",
-      "platform" : "ios",
-      "size" : "1024x1024"
+      "filename": "app-icon-kangkang-1024.png",
+      "idiom": "universal",
+      "platform": "ios",
+      "size": "1024x1024"
     },
     {
-      "appearances" : [
+      "appearances": [
         {
-          "appearance" : "luminosity",
-          "value" : "dark"
+          "appearance": "luminosity",
+          "value": "dark"
         }
       ],
-      "idiom" : "universal",
-      "platform" : "ios",
-      "size" : "1024x1024"
+      "filename": "app-icon-kangkang-dark-1024.png",
+      "idiom": "universal",
+      "platform": "ios",
+      "size": "1024x1024"
     },
     {
-      "appearances" : [
+      "appearances": [
         {
-          "appearance" : "luminosity",
-          "value" : "tinted"
+          "appearance": "luminosity",
+          "value": "tinted"
         }
       ],
-      "idiom" : "universal",
-      "platform" : "ios",
-      "size" : "1024x1024"
+      "filename": "app-icon-kangkang-tinted-1024.png",
+      "idiom": "universal",
+      "platform": "ios",
+      "size": "1024x1024"
     },
     {
-      "idiom" : "mac",
-      "scale" : "1x",
-      "size" : "16x16"
+      "filename": "app-icon-kangkang-16.png",
+      "idiom": "mac",
+      "scale": "1x",
+      "size": "16x16"
     },
     {
-      "idiom" : "mac",
-      "scale" : "2x",
-      "size" : "16x16"
+      "filename": "app-icon-kangkang-32.png",
+      "idiom": "mac",
+      "scale": "2x",
+      "size": "16x16"
     },
     {
-      "idiom" : "mac",
-      "scale" : "1x",
-      "size" : "32x32"
+      "filename": "app-icon-kangkang-32.png",
+      "idiom": "mac",
+      "scale": "1x",
+      "size": "32x32"
     },
     {
-      "idiom" : "mac",
-      "scale" : "2x",
-      "size" : "32x32"
+      "filename": "app-icon-kangkang-64.png",
+      "idiom": "mac",
+      "scale": "2x",
+      "size": "32x32"
     },
     {
-      "idiom" : "mac",
-      "scale" : "1x",
-      "size" : "128x128"
+      "filename": "app-icon-kangkang-128.png",
+      "idiom": "mac",
+      "scale": "1x",
+      "size": "128x128"
     },
     {
-      "idiom" : "mac",
-      "scale" : "2x",
-      "size" : "128x128"
+      "filename": "app-icon-kangkang-256.png",
+      "idiom": "mac",
+      "scale": "2x",
+      "size": "128x128"
     },
     {
-      "idiom" : "mac",
-      "scale" : "1x",
-      "size" : "256x256"
+      "filename": "app-icon-kangkang-256.png",
+      "idiom": "mac",
+      "scale": "1x",
+      "size": "256x256"
     },
     {
-      "idiom" : "mac",
-      "scale" : "2x",
-      "size" : "256x256"
+      "filename": "app-icon-kangkang-512.png",
+      "idiom": "mac",
+      "scale": "2x",
+      "size": "256x256"
     },
     {
-      "idiom" : "mac",
-      "scale" : "1x",
-      "size" : "512x512"
+      "filename": "app-icon-kangkang-512.png",
+      "idiom": "mac",
+      "scale": "1x",
+      "size": "512x512"
     },
     {
-      "idiom" : "mac",
-      "scale" : "2x",
-      "size" : "512x512"
+      "filename": "app-icon-kangkang-1024.png",
+      "idiom": "mac",
+      "scale": "2x",
+      "size": "512x512"
     }
   ],
-  "info" : {
-    "author" : "xcode",
-    "version" : 1
+  "info": {
+    "author": "xcode",
+    "version": 1
   }
 }