style(CheckoutPage): 优化表单标签样式和文案一致性

将表单中的必填项标签的星号改为红色，并统一将“购物车”文案改为“课程”以提高一致性

 <template>
 <template>
-  <AppLayout :title="orderComplete ? '支付成功' : '结账'" :show-back-button="!orderComplete" :hide-bottom-nav="true" @back-click="router.back()">
+  <AppLayout :title="orderComplete ? '支付成功' : '结账'" :hide-bottom-nav="true" @back-click="router.back()">
     <div v-if="cartItems.length === 0 && !orderComplete" class="h-screen flex flex-col items-center justify-center px-4">
     <div v-if="cartItems.length === 0 && !orderComplete" class="h-screen flex flex-col items-center justify-center px-4">
       <FrostedGlass class="p-6 rounded-xl text-center">
       <FrostedGlass class="p-6 rounded-xl text-center">
         <svg xmlns="http://www.w3.org/2000/svg" class="h-16 w-16 text-gray-400 mx-auto mb-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
         <svg xmlns="http://www.w3.org/2000/svg" class="h-16 w-16 text-gray-400 mx-auto mb-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
@@ -102,7 +102,7 @@
 
 
             <div class="space-y-3">
             <div class="space-y-3">
               <div>
               <div>
-                <label class="block text-sm text-gray-600 mb-1">姓名 *</label>
+                <label class="block text-sm text-gray-600 mb-1">姓名 <span class="text-red-500">*</span></label>
                 <input
                 <input
                   v-model="formData.name"
                   v-model="formData.name"
                   type="text"
                   type="text"
@@ -113,7 +113,7 @@
               </div>
               </div>
 
 
               <div>
               <div>
-                <label class="block text-sm text-gray-600 mb-1">手机号码 *</label>
+                <label class="block text-sm text-gray-600 mb-1">手机号码 <span class="text-red-500">*</span></label>
                 <input
                 <input
                   v-model="formData.phone"
                   v-model="formData.phone"
                   type="tel"
                   type="tel"
@@ -134,7 +134,7 @@
               </div>
               </div>
 
 
               <div>
               <div>
-                <label class="block text-sm text-gray-600 mb-1">联系地址 *</label>
+                <label class="block text-sm text-gray-600 mb-1">联系地址 <span class="text-red-500">*</span></label>
                 <input
                 <input
                   v-model="formData.address"
                   v-model="formData.address"
                   type="text"
                   type="text"
@@ -222,7 +222,7 @@
                 }"
                 }"
                 class="text-sm text-red-500"
                 class="text-sm text-red-500"
               >
               >
-                清空购物车
+                清空课程
               </button>
               </button>
             </div>
             </div>
             <button
             <button
@@ -247,7 +247,7 @@
     <ConfirmDialog
     <ConfirmDialog
       v-model:show="showConfirmDialog"
       v-model:show="showConfirmDialog"
       title="确认删除"
       title="确认删除"
-      :message="itemToDelete ? `确定要删除 ${itemToDelete.title || '此商品'} 吗？` : '确定要清空购物车吗？'"
+      :message="itemToDelete ? `确定要删除 ${itemToDelete.title || '此商品'} 吗？` : '确定要清空课程吗？'"
       @confirm="() => {
       @confirm="() => {
         if (itemToDelete) {
         if (itemToDelete) {
           if (cartItems.length === 1) {
           if (cartItems.length === 1) {