refactor: 清理config.vue未使用的CSS类

- 删除未使用的样式：nav-bar, page-title, input-box, placeholder-style, mini-input, justify-between
- 代码行数从733减少到682（减少51行）

pages/config/config.vue

@@ -424,31 +424,10 @@ onShow(async () => {
   align-items: center;
 }
 
-.justify-between {
-  justify-content: space-between;
-}
-
 .gap-2 {
   gap: 16rpx;
 }
 
-/* 导航栏 */
-.nav-bar {
-  background-color: #fff;
-  padding: var(--status-bar-height) 32rpx 20rpx 32rpx;
-  display: flex;
-  align-items: center;
-  justify-content: space-between;
-  height: 88rpx;
-  box-sizing: content-box;
-}
-
-.page-title {
-  font-size: 34rpx;
-  font-weight: 700;
-  color: #111827;
-}
-
 /* 卡片容器 */
 .section-card {
   background-color: #fff;
@@ -506,20 +485,6 @@ onShow(async () => {
   display: block;
 }
 
-.input-box {
-  background-color: #F9FAFB;
-  border: 2rpx solid #E5E7EB;
-  border-radius: 20rpx;
-  height: 96rpx;
-  padding: 0 32rpx;
-  font-size: 28rpx;
-  color: #1F2937;
-}
-
-.placeholder-style {
-  color: #9CA3AF;
-}
-
 /* 选择器样式 */
 .picker-box {
   background-color: #F9FAFB;
@@ -601,22 +566,6 @@ onShow(async () => {
   display: block;
 }
 
-.mini-input {
-  background-color: #FFFFFF;
-  border: 1rpx solid #E5E7EB;
-  border-radius: 16rpx;
-  height: 72rpx;
-  padding: 0 20rpx;
-  font-size: 26rpx;
-  color: #1F2937;
-}
-
-.mini-input[disabled] {
-  background-color: #F3F4F6;
-  color: #6B7280;
-  cursor: not-allowed;
-}
-
 /* 搜索下拉列表 */
 .relative {
   position: relative;