fix(payment): 同时启用易支付和 Stripe 时显示 Stripe 按钮

VISIBLE_METHOD_ALIASES 漏了 stripe，导致 getVisibleMethods 把后端返回
的 stripe 过滤掉。点 Stripe 按钮时省略 method 查询参数，让落地页渲染
完整的 Payment Element。

frontend/src/components/payment/__tests__/paymentFlow.spec.ts

@@ -33,7 +33,7 @@ function createOrderResult(overrides: Partial<CreateOrderResult> = {}): CreateOr
 }
 
 describe('getVisibleMethods', () => {
-  it('filters hidden provider methods and normalizes aliases', () => {
+  it('normalizes provider aliases and keeps stripe as a top-level method', () => {
     const visible = getVisibleMethods({
       alipay_direct: methodLimit({ single_min: 5 }),
       wxpay: methodLimit({ single_max: 100 }),
@@ -43,6 +43,7 @@ describe('getVisibleMethods', () => {
     expect(visible).toEqual({
       alipay: methodLimit({ single_min: 5 }),
       wxpay: methodLimit({ single_max: 100 }),
+      stripe: methodLimit({ fee_rate: 3 }),
     })
   })
 
@@ -76,6 +77,19 @@ describe('decidePaymentLaunch', () => {
     expect(decision.recovery.outTradeNo).toBe('')
   })
 
+  it('routes Stripe button click to the full Payment Element without a preselected sub-method', () => {
+    const decision = decidePaymentLaunch(createOrderResult({
+      client_secret: 'cs_test',
+    }), {
+      visibleMethod: 'stripe',
+      orderType: 'balance',
+      isMobile: false,
+    })
+
+    expect(decision.kind).toBe('stripe_route')
+    expect(decision.stripeMethod).toBeUndefined()
+  })
+
   it('uses Stripe route flow for mobile WeChat client secret', () => {
     const decision = decidePaymentLaunch(createOrderResult({
       client_secret: 'cs_test',