feat: 添加 SubscribeRwa 组件，优化 RWA 申购功能并更新相关类型定义

src/components/subscribe-rwa/index.vue

@@ -0,0 +1,45 @@
+<script lang='ts' setup>
+const props = defineProps<{
+  unitPrice: number;
+}>();
+
+const walletStore = useWalletStore();
+const { balances } = storeToRefs(walletStore);
+const currentUSDTBalance = computed(() => balances.value[0].available);
+const maxSubscribeNumber = computed(() => {
+  return Math.floor(Number(currentUSDTBalance.value) / props.unitPrice);
+});
+</script>
+
+<template>
+  <ion-content class="ion-padding" :scroll-y="false">
+    <div class="space-y-5 mt-3">
+      <div>申购RWA</div>
+
+      <ion-input :placeholder="`最大可申购数量: ${maxSubscribeNumber}`" type="number" :max="maxSubscribeNumber" />
+
+      <div class="mt-4 text-sm color-(--ion-text-color-secondary)">
+        单价: ${{ unitPrice }}
+      </div>
+
+      <div class="mt-4 text-sm color-(--ion-text-color-secondary)">
+        可用余额: ${{ Number(currentUSDTBalance) }}
+      </div>
+
+      <ion-button expand="block" class="mt-6 ui-button" color="primary">
+        确认申购
+      </ion-button>
+    </div>
+  </ion-content>
+</template>
+
+<style scoped>
+@reference "tailwindcss";
+
+ion-input {
+  @apply rounded-lg;
+  --padding-start: 16px;
+  --padding-end: 16px;
+  border: 1px solid var(--ion-color-light-shade);
+}
+</style>