fix(mp): T40 UI 审查全量修复 + 设计体系一致性优化

Phase 0 基础设施:
- statusTag.ts: getStatusInlineStyle() 移除内联 borderRadius/padding/fontSize，仅返回 {background, color}
- 新增 SEVERITY_COLORS + getSeverityStyle() + getSeverityLabel() 统一告警严重程度样式
- variables.scss: 新增 9 个语义颜色别名 ($success/$danger/$warning/$info 等)
- mixins.scss: 新增 status-inline mixin 统一状态标签样式
- 7 个消费者页面添加 @include status-inline CSS 补偿

Phase 1 HIGH 修复 (4 页面):
- P46 随访管理: 移除 getTypeStyle() 硬编码 fontSize，替换文字 Loading 为组件
- P45 咨询详情医护: 添加 Loading/ErrorState 三态模板 + error ref
- P02 健康数据: 添加 loading ref + Loading 组件 + 错误 toast 提示
- P48 告警中心: 替换本地 SEVERITY_COLORS/SEVERITY_LABELS 为 statusTag.ts 导出

Phase 2 全局一致性:
- 2.1 触控补全: 17 页面为可点击元素添加 min-height: $touch-min
- 2.2 字号替换: 19 文件 31 处硬编码 px → Design Token CSS 变量
- 2.3 颜色替换: 18 文件 ~50 处硬编码十六进制 → SCSS 语义变量
- 2.4 elder-mode.scss: 新增 9 个选择器到触控放大清单

Phase 3 LOW 修复:
- 3.1 统一 Loading: 21 页面旧式文字加载 → <Loading> 组件
- 3.2 useElderClass: 8 页面补全长者模式 class 绑定
- 3.3 零散修复: 按钮 44px→48px，诊断记录添加 scroll-view 无限加载

同时新增 UniApp (Vue 3 + Vite) 小程序完整代码库 (146 文件)

apps/miniprogram-uniapp/src/pages/messages/index.vue

@@ -0,0 +1,108 @@
+<template>
+  <scroll-view scroll-y class="messages-scroll" @scrolltolower="loadMore">
+    <view :class="['messages-page', elderClass]">
+      <GuestGuard>
+        <text class="page-title">消息</text>
+
+        <!-- 消息列表 -->
+        <Loading v-if="loading && messages.length === 0" text="加载中..." />
+        <EmptyState v-else-if="messages.length === 0" icon="📭" title="暂无消息" />
+        <template v-else>
+          <view v-for="msg in messages" :key="msg.id" class="msg-card" @tap="goDetail(msg)">
+            <text class="msg-title">{{ msg.title }}</text>
+            <text class="msg-content">{{ msg.content }}</text>
+            <text class="msg-time">{{ getRelativeTime(msg.created_at) }}</text>
+          </view>
+        </template>
+      </GuestGuard>
+    </view>
+  </scroll-view>
+</template>
+
+<script setup lang="ts">
+import { ref, onMounted } from 'vue'
+import { onShow } from '@dcloudio/uni-app'
+import { useAuthStore } from '@/stores/auth'
+import { useElderClass } from '@/composables/useElderClass'
+import { notificationService } from '@/services/notification'
+import { getRelativeTime } from '@/utils/date'
+import Loading from '@/components/Loading.vue'
+import EmptyState from '@/components/EmptyState.vue'
+import GuestGuard from '@/components/GuestGuard.vue'
+
+const authStore = useAuthStore()
+const { elderClass } = useElderClass()
+
+const loading = ref(false)
+const messages = ref<any[]>([])
+const page = ref(1)
+
+async function fetchMessages() {
+  loading.value = true
+  try {
+    const res = await notificationService.list({ page: page.value, page_size: 20 })
+    messages.value = res || []
+  } catch {
+    messages.value = []
+  }
+  loading.value = false
+}
+
+function loadMore() {
+  page.value++
+  fetchMessages()
+}
+
+function goDetail(msg: any) {
+  if (msg.type === 'consultation') {
+    uni.navigateTo({ url: `/pages-sub/consultation/detail/index?id=${msg.ref_id}` })
+  }
+}
+
+onMounted(fetchMessages)
+onShow(() => { authStore.restore() })
+</script>
+
+<style lang="scss" scoped>
+.messages-scroll {
+  height: 100vh;
+  background: $bg;
+}
+
+.messages-page {
+  padding: 28px 24px 120px;
+}
+
+.page-title {
+  @include section-title;
+}
+
+.msg-card {
+  background: $card;
+  border-radius: $r;
+  padding: 20px 24px;
+  margin-bottom: 16px;
+  box-shadow: $shadow-sm;
+}
+
+.msg-title {
+  display: block;
+  font-size: var(--tk-font-body);
+  font-weight: 600;
+  color: $tx;
+  margin-bottom: 8px;
+}
+
+.msg-content {
+  display: block;
+  font-size: var(--tk-font-body-sm);
+  color: $tx2;
+  margin-bottom: 8px;
+}
+
+.msg-time {
+  display: block;
+  font-size: var(--tk-font-cap);
+  color: $tx3;
+}
+</style>