feat(payment): 优化套餐配置和支付服务

- 简化套餐配置结构，删除冗余的 default.yaml 和 us.yaml
- 优化 Apple IAP 服务和验证逻辑
- 更新套餐数据模型和协议文档
- 添加支付相关测试用例

apps/lib/shared/theme/app_color_palette.dart

@@ -20,6 +20,8 @@ class AppColorPalette extends ThemeExtension<AppColorPalette> {
     required this.warning,
     required this.warningContainer,
     required this.onWarningContainer,
+    required this.incomeGreenBg,
+    required this.incomeGreenText,
   });
 
   final Color accentPurple;
@@ -39,6 +41,8 @@ class AppColorPalette extends ThemeExtension<AppColorPalette> {
   final Color warning;
   final Color warningContainer;
   final Color onWarningContainer;
+  final Color incomeGreenBg;
+  final Color incomeGreenText;
 
   @override
   ThemeExtension<AppColorPalette> copyWith({
@@ -59,6 +63,8 @@ class AppColorPalette extends ThemeExtension<AppColorPalette> {
     Color? warning,
     Color? warningContainer,
     Color? onWarningContainer,
+    Color? incomeGreenBg,
+    Color? incomeGreenText,
   }) {
     return AppColorPalette(
       accentPurple: accentPurple ?? this.accentPurple,
@@ -78,6 +84,8 @@ class AppColorPalette extends ThemeExtension<AppColorPalette> {
       warning: warning ?? this.warning,
       warningContainer: warningContainer ?? this.warningContainer,
       onWarningContainer: onWarningContainer ?? this.onWarningContainer,
+      incomeGreenBg: incomeGreenBg ?? this.incomeGreenBg,
+      incomeGreenText: incomeGreenText ?? this.incomeGreenText,
     );
   }
 
@@ -131,6 +139,8 @@ class AppColorPalette extends ThemeExtension<AppColorPalette> {
         other.onWarningContainer,
         t,
       )!,
+      incomeGreenBg: Color.lerp(incomeGreenBg, other.incomeGreenBg, t)!,
+      incomeGreenText: Color.lerp(incomeGreenText, other.incomeGreenText, t)!,
     );
   }
 }