@

支付提交增加 Tx 预校验：提交前链上验签收款地址与金额，防止转错地址；409 错误展示友好中文提示并自动对账恢复

- 新增 validate_intent_tx 方法及 POST /api/payments/intents/{id}/validate 端点，
  在提交前查链上 receipt 对比收款地址和金额，mismatch 直接拦截
- 新增 handleSubmit409 辅助函数，根据后端错误详情分流处理：
  已支付→自动 reconcile，已过期→提示重下单，其他→透传具体原因
- submit/validate 路由透传后端 detail 字段，生产环境也能看到具体错误
- 手动转账面板粘贴 tx hash 后自动触发验证，绿色/红色提示，
  验证不通过时禁用提交按钮

Tested: tsc --noEmit + ruff check . 均通过
@

web/routers/payments.py

@@ -6,6 +6,7 @@ from web.core import (
     ConfirmPaymentTxRequest,
     CreatePaymentIntentRequest,
     SubmitPaymentTxRequest,
+    ValidatePaymentTxRequest,
     WalletChallengeRequest,
     WalletUnbindRequest,
     WalletVerifyRequest,
@@ -21,6 +22,7 @@ from web.services.payment_api import (
     reconcile_latest_payment,
     submit_payment_tx as submit_payment_tx_service,
     unbind_payment_wallet,
+    validate_payment_tx,
     verify_payment_wallet,
 )
 
@@ -67,6 +69,15 @@ async def payment_get_intent(request: Request, intent_id: str):
     return get_payment_intent(request, intent_id)
 
 
+@router.post("/api/payments/intents/{intent_id}/validate")
+async def payment_validate_tx(
+    request: Request,
+    intent_id: str,
+    body: ValidatePaymentTxRequest,
+):
+    return validate_payment_tx(request, intent_id, body)
+
+
 @router.post("/api/payments/intents/{intent_id}/submit")
 async def payment_submit_tx(
     request: Request,