fix(payment): restore public resume and result flows

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

@@ -73,6 +73,7 @@ describe('decidePaymentLaunch', () => {
     expect(decision.paymentState.paymentType).toBe('alipay')
     expect(decision.stripeMethod).toBe('alipay')
     expect(decision.recovery.resumeToken).toBe('resume-1')
+    expect(decision.recovery.outTradeNo).toBe('')
   })
 
   it('uses Stripe route flow for mobile WeChat client secret', () => {
@@ -94,6 +95,7 @@ describe('decidePaymentLaunch', () => {
       pay_url: 'https://pay.example.com/session/abc',
       payment_mode: 'popup',
       resume_token: 'resume-2',
+      out_trade_no: 'sub2_abc',
     }), {
       visibleMethod: 'wxpay',
       orderType: 'balance',
@@ -103,6 +105,7 @@ describe('decidePaymentLaunch', () => {
     expect(decision.kind).toBe('redirect_waiting')
     expect(decision.paymentState.payUrl).toBe('https://pay.example.com/session/abc')
     expect(decision.recovery.paymentMode).toBe('popup')
+    expect(decision.recovery.outTradeNo).toBe('sub2_abc')
     expect(decision.recovery.resumeToken).toBe('resume-2')
   })
 
@@ -225,6 +228,7 @@ describe('readPaymentRecoverySnapshot', () => {
       expiresAt: '2099-01-01T00:10:00.000Z',
       paymentType: 'alipay',
       payUrl: 'https://pay.example.com/session/33',
+      outTradeNo: 'sub2_33',
       clientSecret: '',
       payAmount: 18,
       orderType: 'balance',
@@ -249,6 +253,7 @@ describe('readPaymentRecoverySnapshot', () => {
       expiresAt: '2024-01-01T00:10:00.000Z',
       paymentType: 'wxpay',
       payUrl: 'https://pay.example.com/session/55',
+      outTradeNo: 'sub2_55',
       clientSecret: '',
       payAmount: 18,
       orderType: 'balance',
@@ -264,10 +269,34 @@ describe('readPaymentRecoverySnapshot', () => {
 
     expect(readPaymentRecoverySnapshot(JSON.stringify({
       ...expiredSnapshot,
+      outTradeNo: 'sub2_55',
       expiresAt: '2099-01-01T00:10:00.000Z',
     }), {
       now: Date.UTC(2099, 0, 1, 0, 1, 0),
       resumeToken: 'other-token',
     })).toBeNull()
   })
+
+  it('keeps backward compatibility with snapshots written before outTradeNo existed', () => {
+    const restored = readPaymentRecoverySnapshot(JSON.stringify({
+      orderId: 44,
+      amount: 18,
+      qrCode: '',
+      expiresAt: '2099-01-01T00:10:00.000Z',
+      paymentType: 'alipay',
+      payUrl: 'https://pay.example.com/session/44',
+      clientSecret: '',
+      payAmount: 18,
+      orderType: 'balance',
+      paymentMode: 'popup',
+      resumeToken: 'resume-44',
+      createdAt: Date.UTC(2099, 0, 1, 0, 0, 0),
+    }), {
+      now: Date.UTC(2099, 0, 1, 0, 1, 0),
+      resumeToken: 'resume-44',
+    })
+
+    expect(restored?.orderId).toBe(44)
+    expect(restored?.outTradeNo).toBe('')
+  })
 })

frontend/src/components/payment/paymentFlow.ts

@@ -34,6 +34,7 @@ export interface PaymentRecoverySnapshot {
   expiresAt: string
   paymentType: string
   payUrl: string
+  outTradeNo: string
   clientSecret: string
   payAmount: number
   orderType: OrderType | ''
@@ -132,6 +133,7 @@ export function decidePaymentLaunch(
     expiresAt: result.expires_at || '',
     paymentType: visibleMethod,
     payUrl: result.pay_url || '',
+    outTradeNo: result.out_trade_no || '',
     clientSecret: result.client_secret || '',
     payAmount: result.pay_amount,
     orderType: context.orderType,
@@ -227,6 +229,7 @@ export function readPaymentRecoverySnapshot(
       || typeof parsed.expiresAt !== 'string'
       || typeof parsed.paymentType !== 'string'
       || typeof parsed.payUrl !== 'string'
+      || (parsed.outTradeNo != null && typeof parsed.outTradeNo !== 'string')
       || typeof parsed.clientSecret !== 'string'
       || typeof parsed.payAmount !== 'number'
       || typeof parsed.paymentMode !== 'string'
@@ -241,7 +244,7 @@ export function readPaymentRecoverySnapshot(
     if (Number.isFinite(expiresAt) && expiresAt <= now) {
       return null
     }
-    if (options.resumeToken && parsed.resumeToken && parsed.resumeToken !== options.resumeToken) {
+    if (options.resumeToken && parsed.resumeToken !== options.resumeToken) {
       return null
     }
 
@@ -252,6 +255,7 @@ export function readPaymentRecoverySnapshot(
       expiresAt: parsed.expiresAt,
       paymentType: parsed.paymentType,
       payUrl: parsed.payUrl,
+      outTradeNo: parsed.outTradeNo || '',
       clientSecret: parsed.clientSecret,
       payAmount: parsed.payAmount,
       orderType: parsed.orderType === 'subscription' ? 'subscription' : 'balance',