fix: 顶栏颜色跟随小程序主题并保留跟随系统

src/pages/shop/detail/index.config.ts

@@ -1,5 +1,6 @@
 export default definePageConfig({
   navigationStyle: 'custom',
+  enablePageMeta: true,
   // 顶部为深色商品大图，状态栏文字设为白色，确保 iOS 时间/电量可见
   navigationBarTextStyle: 'white'
 })

src/pages/shop/detail/index.tsx

@@ -7,6 +7,7 @@ import { ProductCategory } from '../../../types'
 import { useSafeArea } from '../../../hooks/useSafeArea'
 import { useStatusBar } from '../../../hooks/useStatusBar'
 import { useThemeContext } from '../../../context/ThemeContext'
+import ThemedPageMeta from '../../../components/ThemedPageMeta'
 
 const clamp = (v: number, min: number, max: number) => Math.min(Math.max(v, min), max)
 const lerp = (a: number, b: number, t: number) => a + (b - a) * t
@@ -107,6 +108,7 @@ export default function ShopDetailPage() {
   if (!product) {
     return (
       <View className="shop-detail-page">
+        <ThemedPageMeta darkTop />
         <Text style={{ color: '#fff', padding: '40rpx' }}>商品不存在</Text>
       </View>
     )
@@ -114,6 +116,7 @@ export default function ShopDetailPage() {
 
   return (
     <View className="shop-detail-page">
+      <ThemedPageMeta darkTop />
       {/* Fixed Hero */}
       <View className="shop-hero-fixed">
         <View