feat(order): wappay/index 越南地区追加 USDT(Epay) 支付选项

- Order::wappay/index: area_id=3 时合并 pay_list['epay']['type'] 到 payMethod，
  每个选项带 pay_routes 映射到对应 online_order_fac
- wappay.html: select 的 option 加 data-url，JS 按选中项查路由
- 兼容旧行为：未设置 pay_routes 时 fallback 到原 online_order_fac

application/onlinechip/controller/Order.php

@@ -35,10 +35,23 @@ class Order Extends Controller{
 		}
 		$pay_method = $area_list[$user['area_id']]['pay'];
 		if($user && $user['api_token'] == $api_token){
-			$this->assign('online_order_fac',$pay_list[$pay_method]['online_order_fac']);
+			$payMethod  = $pay_list[$pay_method]['type'];
-			$this->assign('payMethod',$pay_list[$pay_method]['type']);
+			$pay_routes = [];
-			$this->assign('client',1);
+			foreach($payMethod as $k => $v){
-			$this->assign('user_info',$user);
+				$pay_routes[$k] = $pay_list[$pay_method]['online_order_fac'];
+			}
+			// 越南地区追加 USDT (Epay)
+			if($user['area_id'] == 3 && !empty($pay_list['epay']['type'])){
+				foreach($pay_list['epay']['type'] as $k => $v){
+					$payMethod[$k]  = $v;
+					$pay_routes[$k] = $pay_list['epay']['online_order_fac'];
+				}
+			}
+			$this->assign('online_order_fac', $pay_list[$pay_method]['online_order_fac']);
+			$this->assign('payMethod',        $payMethod);
+			$this->assign('pay_routes',       $pay_routes);
+			$this->assign('client',           1);
+			$this->assign('user_info',        $user);
 			return $this->fetch();
 		}else{
 			exit('页面错误，请退出再登录！');
@@ -56,10 +69,26 @@ class Order Extends Controller{
 		}
 		$pay_method = $area_list[$user['area_id']]['pay'];
 		if($user && $user['api_token'] == $api_token){
-			$this->assign('online_order_fac',$pay_list[$pay_method]['online_order_fac']);
+			// 主通道（按 area_list 的 pay 配置）
-			$this->assign('payMethod',$pay_list[$pay_method]['type']);
+			$payMethod  = $pay_list[$pay_method]['type'];
-			$this->assign('client',2);
+			$pay_routes = [];
-			$this->assign('user_info',$user);
+			foreach($payMethod as $k => $v){
+				$pay_routes[$k] = $pay_list[$pay_method]['online_order_fac'];
+			}
+
+			// 越南地区追加 USDT (Epay) 通道作为第二选项
+			if($user['area_id'] == 3 && !empty($pay_list['epay']['type'])){
+				foreach($pay_list['epay']['type'] as $k => $v){
+					$payMethod[$k]  = $v;
+					$pay_routes[$k] = $pay_list['epay']['online_order_fac'];
+				}
+			}
+
+			$this->assign('online_order_fac', $pay_list[$pay_method]['online_order_fac']); // 兼容旧模板
+			$this->assign('payMethod',        $payMethod);
+			$this->assign('pay_routes',       $pay_routes);
+			$this->assign('client',           2);
+			$this->assign('user_info',        $user);
 			return $this->fetch();
 		}else{
 			exit('页面错误，请退出再登录！');

application/onlinechip/view/order/wappay.html

@@ -204,7 +204,7 @@
 		<i class="icon"></i>
 		<select class="select" name="pay_type" id="pay_type">
 			<?php foreach($payMethod as $key=>$method): ?>
-			<option value ="<?=$key?>"><?=$method?></option>
+			<option value ="<?=$key?>" data-url="/order/<?=isset($pay_routes[$key])?$pay_routes[$key]:$online_order_fac?>"><?=$method?></option>
 			<?php endForeach; ?>
 		</select>
 	</div>
@@ -233,7 +233,8 @@
 					query.price = price;
 					query.username = username;
 					query.pay_type = pay_type;
-					url = '/order/<?=$online_order_fac ?>';
+					// 每种支付方式对应的 online_order 路由可能不同
+					url = $('#pay_type option:selected').data('url') || '/order/<?=$online_order_fac ?>';
 					//var winRef = window.open("","_blank");
 					$.ajax({
 						url:url,