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/mine/address/add.vue

@@ -1,5 +1,5 @@
 <template>
-  <view class="add-address">
+  <view :style="themeStyle" class="add-address">
     <up-form
       :model="form"
       ref="uForm"
@@ -92,8 +92,10 @@ import { addAddress as addAddressApi, editAddress, getAddressDetail } from '@/ap
 import MCity from '@/components/m-city/m-city.vue'
 import uniMap from '@/components/uniMap'
 import permision from '@/js_sdk/wa-permission/permission.js'
+import { getThemeStyle } from '@/utils/theme'
 
 const store = useStore()
+const themeStyle = computed(() => getThemeStyle(store.state.theme))
 const { proxy } = getCurrentInstance()!
 
 const lightColor = computed(() => store.getters.lightColor)