add: 新增ci diamanté

README.md

@@ -45,6 +45,15 @@ proxy services. Built with Go, it emphasizes performance, security, and scalabil
 - **Node Management**: Monitor and control server nodes.
 - **API Framework**: Comprehensive RESTful APIs for frontend integration.
 
+### Subscription Mode Behavior
+
+The subscription behavior can be switched by the backend config `Subscribe.SingleModel`:
+
+- `false` (**multi-subscription mode**): each successful `purchase` creates a new `user_subscribe` record.
+- `true` (**single-subscription mode**): `purchase` is auto-routed to renewal semantics when the user already has a paid subscription:
+  - a new order is still created,
+  - but the existing subscription is extended (instead of creating another `user_subscribe`).
+
 ## 🚀 Quick Start
 
 ### Prerequisites
@@ -288,4 +297,4 @@ project's development! 🚀
 Please give these projects a ⭐ to support the open-source movement!
 ## 📄 License
 
-This project is licensed under the [GPL-3.0 License](LICENSE).
+This project is licensed under the [GPL-3.0 License](LICENSE).