Fix(送礼):[#6046]输入框限制修改为500字

pkg_user/views/gift/gift.vue

@@ -36,9 +36,11 @@
             <view v-if="showGenerateBtn" class="prompt">
               <textarea
                 v-model.trim="aiCoverDesc"
+                :maxlength="500"
                 placeholder="请描述你想生成的图片"
                 class="prompt-textarea"
               />
+              <p class="prompt-tips">{{ aiCoverDesc.length }}/500</p>
             </view>
             <view v-else class="imgs-list-wrap">
               <view class="img-item" v-for="(item, index) in aiCoverImgsList" :key="index">
@@ -1301,13 +1303,18 @@ export default {
         height: 200rpx;
         background: #fff;
         border-radius: 16rpx;
-        padding: 0 20rpx 20rpx 20rpx;
+        padding: 0 20rpx 12rpx 20rpx;
         box-sizing: border-box;
         overflow-y: auto;
         font-size: 28rpx;
         color: #333333;
         line-height: 40rpx;
       }
+      .prompt-tips {
+        font-size: 24rpx;
+        color: #999;
+        text-align: right;
+      }
     }
     .imgs-list-wrap {
       display: flex;