查询绑定结果增加预期账号比对：mismatch 提前拦截

- 下单 data 传了 game_account 时，bind-result 返回 expected_game_account 与 mismatch
- 绑定账号与预期不一致时 message 提示，配合 submit 已有的一致性校验提前发现
- 对接文档补充 mismatch 字段与说明

backend/internal/service/delivery.go

@@ -135,6 +135,8 @@ type DeliveryBindResult struct {
 	GameAccount         string `json:"game_account,omitempty"`
 	RoleName            string `json:"role_name,omitempty"`
 	GameChannel         string `json:"game_channel,omitempty"`
+	ExpectedGameAccount string `json:"expected_game_account,omitempty"`
+	Mismatch            bool   `json:"mismatch,omitempty"`
 	Message             string `json:"message,omitempty"`
 }
 
@@ -220,14 +222,24 @@ func (s *DeliveryService) GetBindResult(merchantID uint, orderNo, bindUUID strin
 		}
 		return nil, err
 	}
-	return &DeliveryBindResult{
+	boundAccount := stringFromMap(account, "game_account")
+	result := &DeliveryBindResult{
 		BindUUID:    bindUUID,
 		Bound:       true,
-		GameAccount: stringFromMap(account, "game_account"),
+		GameAccount: boundAccount,
 		RoleName:    stringFromMap(account, "game_account_role_name"),
 		GameChannel: gameChannelText(account),
 		Message:     "绑定成功",
-	}, nil
+	}
+	// 下单时 data 透传的预期账号：绑定账号与预期不一致时提示，供自建页提前拦截。
+	if expected := requestDataString(order.RequestData, "game_account"); expected != "" {
+		result.ExpectedGameAccount = expected
+		if boundAccount != expected {
+			result.Mismatch = true
+			result.Message = "绑定成功，但绑定账号与下单预期账号不一致，请确认"
+		}
+	}
+	return result, nil
 }
 
 func (s *DeliveryService) bindWithOrder(orderNo, gameAccount string, auth *DeliveryLinkAuth, merchantID uint) (*DeliveryBindResult, error) {

backend/internal/service/fulfillment.go

@@ -1322,6 +1322,14 @@ func requestDataMap(raw string) map[string]interface{} {
 	return m
 }
 
+// requestDataString 读取下单透传 data 中的字符串字段。
+func requestDataString(raw, key string) string {
+	if v, ok := requestDataMap(raw)[key].(string); ok {
+		return strings.TrimSpace(v)
+	}
+	return ""
+}
+
 func resultDataString(raw, key string) string {
 	if v, ok := resultDataMap(raw)[key].(string); ok {
 		return v

frontend/src/openapi/endpoints.ts

@@ -378,7 +378,9 @@ export const endpoints: EndpointSpec[] = [
     "game_account": "4808146277",
     "role_name": "巫师哈丁12",
     "game_channel": "IOS-微信",
-    "message": "绑定成功"
+    "expected_game_account": "1192083858",
+    "mismatch": true,
+    "message": "绑定成功，但绑定账号与下单预期账号不一致，请确认"
   }
 }`,
     responseFields: [
@@ -387,11 +389,14 @@ export const endpoints: EndpointSpec[] = [
       { name: 'game_account', type: 'string', desc: '玩家编号（已绑定时返回）' },
       { name: 'role_name', type: 'string', desc: '角色名（已绑定时返回）' },
       { name: 'game_channel', type: 'string', desc: '区服渠道（已绑定时返回）' },
+      { name: 'expected_game_account', type: 'string', desc: '下单时 data 透传的预期账号（有传时才返回）' },
+      { name: 'mismatch', type: 'bool', desc: '绑定账号与预期账号不一致（下单传了预期账号时才可能为 true）' },
       { name: 'message', type: 'string', desc: '状态说明' },
     ],
     notes: [
       '用户扫码绑定完成前返回 bound=false，自建页可定时轮询此接口刷新状态。',
       '轮询间隔建议 2-3 秒，绑定成功后展示角色信息并引导提交发货。',
+      '下单时 data 传了 game_account 的情况下，绑定账号不一致会返回 mismatch=true，提交发货也会被拒绝（请让买家绑回预期账号或重新下单）。',
     ],
   },
   {