feat(支付): 新增Apple IAP支付支持

实现Apple应用内购支付功能，包括：
1. 新增AppleIAP和ApplePay支付平台枚举
2. 添加IAP验证接口/v1/public/iap/verify处理初购验证
3. 实现Apple服务器通知处理逻辑/v1/iap/notifications
4. 新增JWS验签和JWKS公钥缓存功能
5. 复用现有订单系统处理IAP支付订单

相关文档已更新，包含接入方案和实现细节

internal/handler/notify/appleIAPNotifyHandler.go

@@ -0,0 +1,20 @@
+package notify
+
+import (
+    "github.com/gin-gonic/gin"
+    "github.com/perfect-panel/server/internal/logic/notify"
+    "github.com/perfect-panel/server/internal/svc"
+    "github.com/perfect-panel/server/pkg/result"
+)
+
+// AppleIAPNotifyHandler 处理 Apple Server Notifications v2
+// 参数: 原始 HTTP 请求体
+// 返回: 处理结果（空体 200）
+func AppleIAPNotifyHandler(svcCtx *svc.ServiceContext) func(c *gin.Context) {
+    return func(c *gin.Context) {
+        l := notify.NewAppleIAPNotifyLogic(c.Request.Context(), svcCtx)
+        err := l.Handle(c.Request)
+        result.HttpResult(c, gin.H{"success": err == nil}, err)
+    }
+}
+

internal/handler/notify/paymentNotifyHandler.go

@@ -39,7 +39,7 @@ func PaymentNotifyHandler(svcCtx *svc.ServiceContext) func(c *gin.Context) {
 				return
 			}
 			c.String(http.StatusOK, "%s", "success")
-		case payment.Stripe:
+		case payment.Stripe, payment.ApplePay:
 			l := notify.NewStripeNotifyLogic(c.Request.Context(), svcCtx)
 			if err := l.StripeNotify(c.Request, c.Writer); err != nil {
 				result.HttpResult(c, nil, err)