更新 VIP 会员描述和产品 ID 逻辑，优化购买按钮样式以提升用户体验。

soul-api/internal/handler/miniprogram.go

@@ -244,6 +244,8 @@ func miniprogramPayPost(c *gin.Context) {
 	if description == "" {
 		if req.ProductType == "fullbook" {
 			description = "《一场Soul的创业实验》全书"
+		} else if req.ProductType == "vip" {
+			description = "卡若创业派对VIP年度会员（365天）"
 		} else if req.ProductType == "match" {
 			description = "购买匹配次数"
 		} else {
@@ -265,7 +267,14 @@ func miniprogramPayPost(c *gin.Context) {
 	
 	productID := req.ProductID
 	if productID == "" {
-		productID = "fullbook"
+		switch req.ProductType {
+		case "vip":
+			productID = "vip_annual"
+		case "match":
+			productID = "match"
+		default:
+			productID = "fullbook"
+		}
 	}
 	
 	status := "created"