fix: match legacy channel business owner display

internal/biz/business/channel.go

@@ -49,9 +49,7 @@ type Channel struct {
 }
 
 func (c *Channel) BusinessDisplayName() string {
-	if len(c.BusinessPath) > 0 {
-		return strings.Join(c.BusinessPath, "→")
-	}
+	// 沿用旧商务系统：显示绑定的平台商务账号及当前商务登录名。
 	account, user := strings.TrimSpace(c.BindingAccount), strings.TrimSpace(c.BindingUserName)
 	if account == "" {
 		return user