设置 App 图标与启动页，并修复记分详情回显与环值分布溢出。

同步恢复试用次数校验，免费额度调整为 2 次，便于验证 IAP 流程。

Co-authored-by: Cursor <cursoragent@cursor.com>

pubspec.yaml

@@ -24,8 +24,27 @@ dev_dependencies:
   flutter_lints: ^6.0.0
   build_runner: ^2.4.7
   isar_generator: 3.1.0+1
+  flutter_launcher_icons: ^0.14.4
+  flutter_native_splash: ^2.4.4
+
+flutter_launcher_icons:
+  android: true
+  ios: true
+  image_path: assets/branding/app_icon.png
+  remove_alpha_ios: true
+  adaptive_icon_background: "#F5C400"
+  adaptive_icon_foreground: assets/branding/app_icon.png
+
+flutter_native_splash:
+  background_image: assets/branding/splash.png
+  android_12:
+    color: "#FFFFFF"
+    image: assets/branding/app_icon.png
+  ios: true
+  android: true
 
 flutter:
   uses-material-design: true
   assets:
     - assets/images/
+    - assets/branding/