onboarding: 选项字体与问题一致、底部间距、提醒页文案与移除底部 Skip

Co-authored-by: Cursor <cursoragent@cursor.com>

client/constants/OnboardingTheme.ts

@@ -1,3 +1,10 @@
+import { Platform } from 'react-native';
+
+/** 与 onboarding 问题标题一致的字体（PingFang TC / sans-serif） */
+export const OnboardingFont = {
+  question: Platform.OS === 'ios' ? 'PingFang TC' : 'sans-serif',
+};
+
 export const OnboardingColors = {
   background: '#FFF4EA',
   textPrimary: '#772F00',