style(theme): 统一应用主题样式并更新组件样式变量

- 在多个页面组件中添加动态主题样式绑定
- 将硬编码的颜色值替换为CSS变量和主题配置
- 引入主题样式计算逻辑到各个页面
- 更新优惠券、地址、订单等页面的主题适配
- 替换线性渐变背景为动态主题颜色
- 移除uni_modules组件中的$set方法调用以优化性能
- 更新README中主题色管理状态为已完成

pages/cart/payment/shareOrderGoods.vue

@@ -1,5 +1,5 @@
 <template>
-  <view class="wrapper" v-if="flag">
+  <view :style="themeStyle" class="wrapper" v-if="flag">
     <div class='goods' v-if="selectedGoods">
       <image class="goods-image" :src="selectedGoods.thumbnail" alt="" />
       <p class="goodsName">{{selectedGoods.goodsName}}</p>
@@ -96,8 +96,10 @@ import shares from '@/components/m-share/index'
 import storage from '@/utils/storage.js'
 import popupGoods from '@/components/m-buy/goods'
 import { unitPrice } from '@/utils/filters.js'
+import { getThemeStyle } from '@/utils/theme'
 
 const store = useStore()
+const themeStyle = computed(() => getThemeStyle(store.state.theme))
 
 const popupGoodsRef = ref<any>(null)
 const flag = ref(false)