style: enhance visibility of Apple sweepstakes disclaimer on room list header

app/dimension/room.tsx

@@ -147,9 +147,11 @@ export default function RoomScreen() {
           {/* iOS 特有免责声明 (应 Apple 审核要求显眼展示) */}
           {Platform.OS === 'ios' && (
              <View style={{ paddingHorizontal: 15, marginBottom: 15, alignItems: 'center' }}>
-               <Text style={{ color: 'rgba(255,255,255,0.4)', fontSize: 10, textAlign: 'center' }}>
-                 特别声明：本平台所有活动与苹果公司（Apple Inc.）无关
-               </Text>
+               <View style={{ backgroundColor: 'rgba(0,0,0,0.4)', paddingHorizontal: 12, paddingVertical: 6, borderRadius: 12 }}>
+                 <Text style={{ color: 'rgba(255,255,255,0.85)', fontSize: 11, textAlign: 'center' }}>
+                   特别声明：本平台所有活动与苹果公司（Apple Inc.）无关
+                 </Text>
+               </View>
              </View>
           )}