style(adapter): 更新网格适配器高亮样式

- 将 setBackgroundColor 替换为 setBackgroundResource 使用形状资源
- 为 Seasoning18GridAdapter 和 Seasoning22GridAdapter 统一高亮样式
- 添加 shape_scale_cell_highlight.xml 定义圆角橙色背景
- 移除硬编码颜色值，提高样式可维护性

app/src/main/java/com/shuwei/dish/match/adapter/Seasoning18GridAdapter.kt

@@ -93,7 +93,7 @@ class Seasoning18GridAdapter(
             holder.b.tvState.text  = stateStr(item.state)
         }
         if (position == highlightedPosition) {
-            holder.b.root.setBackgroundColor(ContextCompat.getColor(holder.b.root.context, R.color.red_ff4444))
+            holder.b.root.setBackgroundResource(R.drawable.shape_scale_cell_highlight)
             val white = ContextCompat.getColor(holder.b.root.context, R.color.white)
             holder.b.tvAddress.setTextColor(white)
             holder.b.tvName.setTextColor(white)

app/src/main/java/com/shuwei/dish/match/adapter/Seasoning22GridAdapter.kt

@@ -95,7 +95,7 @@ class Seasoning22GridAdapter(
         }
         // 高亮格子：红底白字；其余恢复默认
         if (position == highlightedPosition) {
-            holder.b.root.setBackgroundColor(ContextCompat.getColor(holder.b.root.context, R.color.red_ff4444))
+            holder.b.root.setBackgroundResource(R.drawable.shape_scale_cell_highlight)
             val white = ContextCompat.getColor(holder.b.root.context, R.color.white)
             holder.b.tvAddress.setTextColor(white)
             holder.b.tvName.setTextColor(white)

app/src/main/res/drawable/shape_scale_cell_highlight.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- 秤格子背景：白色底 + 灰色描边 + 圆角，与页面蓝色背景形成对比 -->
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <solid android:color="#FA9523" />
+    <corners android:radius="8dp" />
+</shape>