feat(payment): implement coffee tip plans and update payment flow

src/data/services/api/api_path.ts

@@ -67,6 +67,9 @@ export class ApiPath {
   /** 获取商品套餐列表 */
   static readonly paymentPlans = `${ApiPath._payment}/plans`;
 
+  /** 获取咖啡打赏套餐列表 */
+  static readonly paymentTipPlans = `${ApiPath._payment}/tip-plans`;
+
   // ============ 聊天相关 ============
   /** 发送消息 */
   static readonly chatSend = `${ApiPath._chat}/send`;