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

src/data/services/api/payment_api.ts

@@ -8,6 +8,7 @@ import {
   CreatePaymentOrderResponse,
   PaymentOrderStatusResponse,
   PaymentPlansResponse,
+  TipPaymentPlansResponse,
 } from "@/data/dto/payment";
 
 import { ApiPath } from "./api_path";
@@ -25,6 +26,16 @@ export class PaymentApi {
     );
   }
 
+  /** 获取咖啡打赏套餐列表。 */
+  async getTipPlans(): Promise<TipPaymentPlansResponse> {
+    const env = await httpClient<ApiEnvelope<unknown>>(
+      ApiPath.paymentTipPlans,
+    );
+    return TipPaymentPlansResponse.fromJson(
+      unwrap(env) as Record<string, unknown>,
+    );
+  }
+
   /**
    * 创建支付订单
    */