add staging ios app build script

app-expo/src/core/config.ts

@@ -12,11 +12,21 @@ function resolveAppVariant(): AppVariant {
   if (__DEV__) {
     return 'development';
   }
+  // Release 包若 env 未写入 APP_VARIANT（例如仅复制了 env/staging 到 .env 但变量缺失），
+  // 仍按 API 是否为 http 推断预发，避免关于页误隐藏后端地址。
+  const apiUrl = process.env.EXPO_PUBLIC_API_URL ?? '';
+  if (apiUrl.startsWith('http://')) {
+    return 'staging';
+  }
   return 'production';
 }
 
-/** Shown on About screen for dev/staging builds only. */
+/** Shown on About screen for dev/staging builds only (never production Release). */
 export function shouldShowAboutBackendUrl(variant: AppVariant = appVariant): boolean {
+  // Metro / 调试包：始终显示，避免 .env 误用 production variant 时看不到实际 API
+  if (__DEV__) {
+    return true;
+  }
   return variant === 'development' || variant === 'staging';
 }