refactor(mp): 迁移创建页 — 使用 PageShell + ContentCard 统一组件库

处方创建、透析记录创建、预约创建三个表单页迁移：
- 最外层容器 ScrollView/View → PageShell
- 表单分组 section View → ContentCard
- SCSS 删除 min-height/background/box-shadow 通用样式

apps/miniprogram/src/pages/appointment/create/index.tsx

@@ -7,6 +7,8 @@ import { TEMPLATE_IDS } from '@/services/wechat-templates';
 import { trackEvent } from '@/services/analytics';
 import StepIndicator from '../../../components/StepIndicator';
 import WeekCalendar from '../../../components/WeekCalendar';
+import PageShell from '@/components/ui/PageShell';
+import ContentCard from '@/components/ui/ContentCard';
 import { useElderClass } from '../../../hooks/useElderClass';
 import { useSafeTimeout } from '@/hooks/useSafeTimeout';
 import './index.scss';
@@ -153,7 +155,7 @@ export default function AppointmentCreate() {
   };
 
   return (
-    <View className={`create-page ${modeClass}`}>
+    <PageShell padding="none" safeBottom={false} scroll={false} className={modeClass}>
       <StepIndicator
         steps={[{ label: '选科室' }, { label: '选医生' }, { label: '选时段' }]}
         current={currentStep}
@@ -222,7 +224,7 @@ export default function AppointmentCreate() {
         <View className='step-content'>
           <Text className='step-title'>选择就诊时间</Text>
 
-          <View className='confirm-card'>
+          <ContentCard className='confirm-card'>
             <View className='confirm-row'>
               <View className='confirm-icon-wrap'>
                 <Text className='confirm-icon-serif'>医</Text>
@@ -235,7 +237,7 @@ export default function AppointmentCreate() {
                 <Text className='confirm-dept-text'>{department}</Text>
               </View>
             </View>
-          </View>
+          </ContentCard>
 
           <WeekCalendar
             scheduledDates={scheduledDates}
@@ -295,6 +297,6 @@ export default function AppointmentCreate() {
           </View>
         )}
       </View>
-    </View>
+    </PageShell>
   );
 }