feat(login): 添加短信验证码倒计时功能

- 实现了一个倒计时函数 startCountdown，用于在发送验证码后启动 60 秒倒计时
- 在登录表单中添加了倒计时显示，当倒计时大于 0 时禁用重新发送按钮
- 成功发送验证码后启动倒计时

app/pages/login/index.vue

@@ -19,6 +19,17 @@ const isReal=ref(false) //isReal 是否实名过
 function goToPage() {
   router.push('/countryRegion');
 }
+const startCountdown=()=> {
+  countdown.value = 60;
+  const interval = setInterval(() => {
+    if (countdown.value > 0) {
+      countdown.value--;
+    } else {
+      clearInterval(interval);
+    }
+  }, 1000);
+}
+const countdown = ref(0);
 const phoneNum = ref('')
 const code = ref('')
 const pane = ref(0)
@@ -74,10 +85,11 @@ const getCode =async () => {
  })
   loadingRef.value.loading1=false
   if (res.status===0){
-
     pane.value = 1
     vanSwipeRef.value?.swipeTo(pane.value)
     showKeyboard.value=true
+    startCountdown();
+
   }
 
 }
@@ -132,8 +144,8 @@ const goLogin = () => {
             <div class="text-[16px] text-[#000]">+{{ selectedZone }} {{ phoneNum }}</div>
           </div>
           <van-password-input :value="code" :gutter="10" :mask="false" focused @focus="showKeyboard = true" />
-          <div class="text-#2B53AC text-14px">
-            {{ $t('login.reSend') }}
+          <div :class="`${countdown>0?'text-#BDBDBD':'text-#2B53AC'}  text-14px`">
+            {{ $t('login.reSend') }}<span v-if="countdown>0">({{countdown}})</span>
           </div>
           <div class="mt-[17px]">
             <van-button v-if="code.length === 6" type="primary" block style="height: 48px" @click="goLogin">{{