fix: restore wechat payment oauth and jsapi flow

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

@@ -105,6 +105,50 @@ describe('decidePaymentLaunch', () => {
     expect(decision.recovery.paymentMode).toBe('popup')
     expect(decision.recovery.resumeToken).toBe('resume-2')
   })
+
+  it('returns wechat oauth launch when backend requires in-app authorization', () => {
+    const decision = decidePaymentLaunch(createOrderResult({
+      result_type: 'oauth_required',
+      payment_type: 'wxpay',
+      oauth: {
+        authorize_url: '/api/v1/auth/oauth/wechat/payment/start?payment_type=wxpay',
+        appid: 'wx123',
+        scope: 'snsapi_base',
+        redirect_url: '/auth/wechat/payment/callback',
+      },
+    }), {
+      visibleMethod: 'wxpay',
+      orderType: 'balance',
+      isMobile: true,
+    })
+
+    expect(decision.kind).toBe('wechat_oauth')
+    expect(decision.oauth?.authorize_url).toContain('/api/v1/auth/oauth/wechat/payment/start')
+    expect(decision.paymentState.paymentType).toBe('wxpay')
+  })
+
+  it('returns wechat jsapi launch when backend has a jsapi payload ready', () => {
+    const decision = decidePaymentLaunch(createOrderResult({
+      result_type: 'jsapi_ready',
+      payment_type: 'wxpay',
+      jsapi: {
+        appId: 'wx123',
+        timeStamp: '1712345678',
+        nonceStr: 'nonce-123',
+        package: 'prepay_id=wx123',
+        signType: 'RSA',
+        paySign: 'signed-payload',
+      },
+    }), {
+      visibleMethod: 'wxpay',
+      orderType: 'subscription',
+      isMobile: true,
+    })
+
+    expect(decision.kind).toBe('wechat_jsapi')
+    expect(decision.jsapi?.appId).toBe('wx123')
+    expect(decision.paymentState.orderType).toBe('subscription')
+  })
 })
 
 describe('buildCreateOrderPayload', () => {

frontend/src/components/payment/paymentFlow.ts

@@ -1,4 +1,11 @@
-import type { CreateOrderRequest, CreateOrderResult, MethodLimit, OrderType } from '@/types/payment'
+import type {
+  CreateOrderRequest,
+  CreateOrderResult,
+  MethodLimit,
+  OrderType,
+  WechatJSAPIPayload,
+  WechatOAuthInfo,
+} from '@/types/payment'
 
 export const PAYMENT_RECOVERY_STORAGE_KEY = 'payment.recovery.current'
 
@@ -16,6 +23,8 @@ export type PaymentLaunchKind =
   | 'redirect_waiting'
   | 'stripe_popup'
   | 'stripe_route'
+  | 'wechat_oauth'
+  | 'wechat_jsapi'
   | 'unhandled'
 
 export interface PaymentRecoverySnapshot {
@@ -47,6 +56,8 @@ export interface PaymentLaunchDecision {
   paymentState: PaymentRecoverySnapshot
   recovery: PaymentRecoverySnapshot
   stripeMethod?: StripeVisibleMethod
+  oauth?: WechatOAuthInfo
+  jsapi?: WechatJSAPIPayload
 }
 
 export interface BuildCreateOrderPayloadInput {
@@ -139,6 +150,15 @@ export function decidePaymentLaunch(
     return { kind, paymentState, recovery: paymentState, stripeMethod }
   }
 
+  if (result.result_type === 'oauth_required' && result.oauth?.authorize_url) {
+    return { kind: 'wechat_oauth', paymentState: baseState, recovery: baseState, oauth: result.oauth }
+  }
+
+  const jsapiPayload = result.jsapi ?? result.jsapi_payload
+  if (result.result_type === 'jsapi_ready' && jsapiPayload) {
+    return { kind: 'wechat_jsapi', paymentState: baseState, recovery: baseState, jsapi: jsapiPayload }
+  }
+
   if (baseState.qrCode) {
     return { kind: 'qr_waiting', paymentState: baseState, recovery: baseState }
   }