feat: 转账页面合约账户支持 + 实时汇率显示

1. 合约账户作为转账选项（原FTKbot改为Contract）
2. BTC/ETH↔合约时显示USDT等值转换提示
3. 合约→现货时显示合约USDT可用余额

pages/asset/transfer.vue

@@ -65,7 +65,11 @@
 			<view v-if="selectCurr.name" class="flex align-center">
 				<text class="font-26">{{i18n.assets.transfer.usable}}</text>
 				<u-count-to fontSize="26" :color="theme.text" :endVal="available_num" :decimals="4" :duration="400"></u-count-to>
-				<text class="font-26">{{selectCurr.name}}</text>
+				<text class="font-26">{{showConvertUnit}}</text>
+			</view>
+			<!-- 合约转换提示 -->
+			<view v-if="needConversion && inputNum > 0" class="margin-t-10 padding-w-22">
+				<text class="font-24 color-00C481">≈ {{convertedDisplay}}</text>
 			</view>
 			<!-- <p class="font-26 color-333333">可用 {{available_num}} USDT</p> -->
 			<view class="borderBox"  :style="'background-color: '+theme.fu_bg">
@@ -164,19 +168,52 @@
 			i18n() {
 				return this.$t('message');
 			},
+			// 是否涉及合约账户且非USDT（需要汇率转换）
+			needConversion() {
+				if (!this.selectCurr || !this.selectCurr.name) return false
+				const isContract = this.leftObj.id == 3 || this.rightObj.id == 3
+				const isUSDT = this.selectCurr.curr_id == 1 || (this.selectCurr.name || '').toUpperCase() === 'USDT'
+				return isContract && !isUSDT
+			},
+			// 可用余额 — 合约→现货时显示合约USDT余额
 			available_num() {
+				if (this.needConversion && this.leftObj.id == 3) {
+					// 从合约转出：显示合约USDT余额
+					let usdtItem = this.currList.find(c => c.curr_id == 1 || (c.name || '').toUpperCase() === 'USDT')
+					return usdtItem ? (usdtItem.num_lh || 0) : 0
+				}
 				if(this.leftObj.id==1){
-					return this.selectCurr.num || 0 //现货数量
+					return this.selectCurr.num || 0
 				}else if(this.leftObj.id==2){
-					return this.selectCurr.num_fb || 0 //现货数量
+					return this.selectCurr.num_fb || 0
 				}else if(this.leftObj.id==3){
-					return this.selectCurr.num_lh || 0 //现货数量
+					return this.selectCurr.num_lh || 0
 				}else if(this.leftObj.id==4){
-					return this.selectCurr.num_qq || 0 //现货数量
+					return this.selectCurr.num_qq || 0
 				}else{
 					return 0;
 				}
 			},
+			// 显示可用余额的单位
+			showConvertUnit() {
+				if (this.needConversion && this.leftObj.id == 3) {
+					return 'USDT'
+				}
+				return this.selectCurr.name || ''
+			},
+			// 转换后显示
+			convertedDisplay() {
+				if (!this.needConversion || !this.inputNum || this.inputNum <= 0) return ''
+				let rate = parseFloat(this.selectCurr.exchange) || 0
+				if (rate <= 0) return ''
+				if (this.rightObj.id == 3) {
+					// 现货→合约：输入BTC/ETH数量，显示USDT等值
+					return (this.inputNum * rate).toFixed(2) + ' USDT (合约)'
+				} else {
+					// 合约→现货：输入USDT数量，显示BTC/ETH等值
+					return (this.inputNum / rate).toFixed(8) + ' ' + this.selectCurr.name + ' (现货)'
+				}
+			},
 			count_obj() {
 				let obj = [];
 				var that = this

static/locales/en-US.js

@@ -789,7 +789,7 @@ module.exports = {
 				loading:'Loading',
 				xh:'Spot',
 				fb:'Fiat',
-				lh:'FTKbot',
+				lh:'Contract',
 				confirm:'Confirm',
 				cancel:'Cancel',
 			},