feat(subscribe): add inventory check and update logic for subscription plans

pkg/xerr/errCode.go

@@ -70,6 +70,7 @@ const (
 	SubscribeIsUsedError            uint32 = 60004
 	SingleSubscribeModeExceedsLimit uint32 = 60005
 	SubscribeQuotaLimit             uint32 = 60006
+	SubscribeOutOfStock             uint32 = 60007
 )
 
 // Auth error

pkg/xerr/errMsg.go

@@ -55,6 +55,7 @@ func init() {
 		SubscribeIsUsedError:            "Subscribe is used",
 		SingleSubscribeModeExceedsLimit: "Single subscribe mode exceeds limit",
 		SubscribeQuotaLimit:             "Subscribe quota limit",
+		SubscribeOutOfStock:             "Subscribe out of stock",
 
 		// auth error
 		VerifyCodeError: "Verify code error",