feat: 越南充值页加 USDT (TRC20) 通道切换

- recharge2.vue: 银行卡/USDT 两个 tab
- submitEpay 方法调 /epay_online_order 传 pay_type='usdt'
- 防重复提交：submitting loading 状态

src/components/recharge/recharge2.vue

@@ -3,14 +3,36 @@
     <div class="btn off-btn" @click="offPop"></div>
     <div class="btn pay2-btn" v-if="userInfo.area_id != 3" @click="isShowPop('recharge')">{{Language.recharge_offline2}} 》</div>
     <div class="title">{{Language.recharge_online2}}</div>
-    <!-- 越南 AlinPay 在线充值 -->
+    <!-- 越南地区：银行卡 (AlinPay) / USDT (Epay) 双通道 -->
     <div class="view" v-if="userInfo.area_id == 3">
-      <div class="alin-form">
+      <div class="pay-tabs">
+        <div class="pay-tab" :class="{active: payChannel=='alin'}" @click="payChannel='alin'">
+          {{Language.recharge_bank || 'Thẻ ngân hàng'}}
+        </div>
+        <div class="pay-tab" :class="{active: payChannel=='epay'}" @click="payChannel='epay'">
+          USDT (TRC20)
+        </div>
+      </div>
+      <div class="alin-form" v-if="payChannel=='alin'">
         <div class="alin-item">
           <label>{{Language.withdraw_page_withdrawal_amount || '充值金额'}}：</label>
           <input class="input" type="number" v-model="alinAmount" placeholder="Tối thiểu 1,000,000">
         </div>
-        <button class="btn alin-submit" @click="submitAlin">{{Language.withdraw_page_confirm || '确认充值'}}</button>
+        <button class="btn alin-submit" @click="submitAlin" :disabled="submitting">
+          {{submitting ? '...' : (Language.withdraw_page_confirm || '确认充值')}}
+        </button>
+      </div>
+      <div class="alin-form" v-if="payChannel=='epay'">
+        <div class="alin-item">
+          <label>{{Language.withdraw_page_withdrawal_amount || '充值金额'}} (VND)：</label>
+          <input class="input" type="number" v-model="epayAmount" placeholder="Số tiền nạp">
+        </div>
+        <div class="alin-tip">
+          {{Language.recharge_usdt_tip || 'Thanh toán USDT qua mạng TRC20 · Tỷ giá tính theo hệ thống'}}
+        </div>
+        <button class="btn alin-submit" @click="submitEpay" :disabled="submitting">
+          {{submitting ? '...' : (Language.withdraw_page_confirm || '确认充值')}}
+        </button>
       </div>
     </div>
     <!-- 其他渠道 iframe -->
@@ -25,7 +47,10 @@ import { mapState } from 'vuex'
 export default {
   data() {
       return {
+        payChannel: 'alin',
         alinAmount: '',
+        epayAmount: '',
+        submitting: false,
         ApiUrl: JSON.parse(localStorage.getItem('ApiUrl'))
       }
     },
@@ -49,6 +74,8 @@ export default {
         this.$message({type:'warning', message:'Số tiền tối thiểu là 1,000,000'});
         return;
       }
+      if(this.submitting) return;
+      this.submitting = true;
       var encryptstring = encrypt(JSON.stringify({
         user_id: this.userInfo.uid,
         price: this.alinAmount,
@@ -58,6 +85,7 @@ export default {
       })).toString();
       this.$axios.post(this.ApiUrl+'/alin_online_order', {encryptData:encryptstring}).then(
         response=>{
+          this.submitting = false;
           if(response.data.Success==1){
             const data = JSON.parse(decrypt(response.data.Data));
             if(data.status == 1 && data.url){
@@ -69,10 +97,49 @@ export default {
             this.$message({type:'error', message: response.data.Msg || '充值失败'});
           }
       }).catch(error=>{
+        this.submitting = false;
         console.log(error);
         this.$message({type:'error', message:'充值请求失败'});
       });
     },
+    submitEpay(){
+      if(!this.epayAmount || this.epayAmount <= 0){
+        this.$message({type:'warning', message:'Vui lòng nhập số tiền!'});
+        return;
+      }
+      if(this.epayAmount < 1000000){
+        this.$message({type:'warning', message:'Số tiền tối thiểu là 1,000,000'});
+        return;
+      }
+      if(this.submitting) return;
+      this.submitting = true;
+      var encryptstring = encrypt(JSON.stringify({
+        user_id: this.userInfo.uid,
+        price: this.epayAmount,
+        client: 1,
+        username: this.userInfo.nickname,
+        pay_type: 'usdt',
+        api_token: this.userInfo.api_token,
+      })).toString();
+      this.$axios.post(this.ApiUrl+'/epay_online_order', {encryptData:encryptstring}).then(
+        response=>{
+          this.submitting = false;
+          if(response.data.Success==1){
+            const data = JSON.parse(decrypt(response.data.Data));
+            if(data.status == 1 && data.url){
+              window.open(data.url, '_blank');
+            } else {
+              this.$message({type:'error', message: data.message || 'Nạp thất bại'});
+            }
+          } else {
+            this.$message({type:'error', message: response.data.Msg || 'Nạp thất bại'});
+          }
+      }).catch(error=>{
+        this.submitting = false;
+        console.log(error);
+        this.$message({type:'error', message:'Yêu cầu thất bại'});
+      });
+    },
  },
  computed: {
   ...mapState(['userInfo','webconfig','Language'])
@@ -122,8 +189,44 @@ export default {
     width:100%;
     height: 250px;
   }
+  .recharge2 .pay-tabs{
+    display: flex;
+    padding: 10px 40px 0;
+    gap: 10px;
+  }
+  .recharge2 .pay-tab{
+    flex: 1;
+    text-align: center;
+    padding: 8px 0;
+    color: #aaa;
+    background: rgba(0,0,0,0.3);
+    border: 1px solid #907545;
+    border-radius: 5px;
+    cursor: pointer;
+    font-size: 13px;
+    user-select: none;
+    transition: all .2s;
+  }
+  .recharge2 .pay-tab:hover{ color: #e5b932; }
+  .recharge2 .pay-tab.active{
+    background: linear-gradient(to right, #e5b932, #c5971e);
+    color: #161107;
+    font-weight: bold;
+    border-color: #e5b932;
+  }
+  .recharge2 .alin-tip{
+    color: #e5b932;
+    font-size: 12px;
+    line-height: 1.5;
+    margin: -5px 0 15px;
+    opacity: 0.85;
+  }
+  .recharge2 .alin-submit:disabled{
+    opacity: 0.5;
+    cursor: not-allowed;
+  }
   .recharge2 .alin-form{
-    padding: 30px 40px;
+    padding: 20px 40px;
   }
   .recharge2 .alin-item{
     margin-bottom: 15px;