feat(iap/apple): 实现苹果IAP非续期订阅功能

新增苹果IAP相关接口与逻辑，包括产品列表查询、交易绑定、状态查询和恢复购买功能。移除旧的IAP验证逻辑，重构订阅系统以支持苹果IAP交易记录存储和权益计算。

- 新增/pkg/iap/apple包处理JWS解析和产品映射
- 实现GET /products、POST /attach、POST /restore和GET /status接口
- 新增apple_iap_transactions表存储交易记录
- 更新文档说明配置方式和接口规范
- 移除旧的AppleIAP验证和通知处理逻辑

pkg/payment/platform.go

@@ -10,7 +10,6 @@ const (
 	EPay
 	Balance
 	CryptoSaaS
-	AppleIAP
 	UNSUPPORTED Platform = -1
 )
 
@@ -20,7 +19,6 @@ var platformNames = map[string]Platform{
 	"AlipayF2F":   AlipayF2F,
 	"EPay":        EPay,
 	"balance":     Balance,
-	"AppleIAP":    AppleIAP,
 	"unsupported": UNSUPPORTED,
 }
 
@@ -49,7 +47,7 @@ func GetSupportedPlatforms() []types.PlatformInfo {
 				"public_key":     "Publishable key",
 				"secret_key":     "Secret key",
 				"webhook_secret": "Webhook secret",
-				"payment":        "Payment Method, only supported card/alipay/wechat_pay/apple_pay",
+				"payment":        "Payment Method, only supported card/alipay/wechat_pay",
 			},
 		},
 		{
@@ -82,15 +80,5 @@ func GetSupportedPlatforms() []types.PlatformInfo {
 				"secret_key": "Secret Key",
 			},
 		},
-		{
-			Platform:    AppleIAP.String(),
-			PlatformUrl: "https://developer.apple.com/help/app-store-connect/",
-			PlatformFieldDescription: map[string]string{
-				"issuer_id":   "App Store Connect Issuer ID",
-				"key_id":      "App Store Connect Key ID",
-				"private_key": "Private Key (ES256)",
-				"environment": "Environment: Sandbox/Production",
-			},
-		},
 	}
 }