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/im/index.vue

@@ -1,5 +1,5 @@
 <template>
-  <view class="wrapper">
+  <view :style="themeStyle" class="wrapper">
     <u-navbar
       class="my-title"
       title-size="32"
@@ -197,7 +197,7 @@
 </template>
 
 <script setup lang="ts">
-import { ref, nextTick, getCurrentInstance } from 'vue'
+import { ref, nextTick, getCurrentInstance, computed } from 'vue'
 import {
   onLoad,
   onHide,
@@ -215,6 +215,10 @@ import storage from '@/utils/storage.js'
 import { beautifyTime, unitPrice } from '@/utils/filters.js'
 import config from '@/config/config.js'
 import { textReplaceEmoji, emojistwo } from '@/utils/emojis.js'
+import { useStore } from '@/store'
+import { getThemeStyle } from '@/utils/theme'
+const store = useStore()
+const themeStyle = computed(() => getThemeStyle(store.state.theme))
 
 // rpx和px的比率
 let l: number