refactor(auth): 调试授权参数去掉遗留 channel 字段

与后端 GenerateAuthUrlParam 对齐，通道认证调试只传 authType / product / channelMchNo。

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/daxpay-admin/src/api/payment/develop/developAuth.api.ts

@@ -70,8 +70,6 @@ export interface AuthResult {
 
 /** 微信支付授权链接参数 */
 export interface ChannelAuthUrlParam {
-  /** 通道(固定 wechat) */
-  channel: string;
   /** 认证类型(固定 wechat) */
   authType: string;
   /** 支付产品(wechat_pay 直连 / wechat_isv 服务商), 可选, 缺失时后端从通道商户号反查 */

apps/daxpay-admin/src/views/payment/develop/auth/ChannelAuth.vue

@@ -211,7 +211,6 @@
             : authType.value === 'douyin'
               ? DevelopAuthApi.generateDouyinAuthUrl()
               : DevelopAuthApi.generateChannelAuthUrl({
-                  channel: 'wechat',
                   authType: 'wechat',
                   mchNo: form.mchNo,
                   channelMchNo: form.channelMchNo,