add staging ios app build script

.github/workflows/app-expo-deploy.yml

@@ -8,12 +8,12 @@
 #   - 若需用 x86 模拟器验证此 APK，需改回含 x86 的 ABI 或另建 job。
 #
 # 环境映射（与后端 api 一致：main → 预发 staging，tag → 生产 production）：
-#   push main     → stage   → node scripts/use-env.js staging → .env.staging
-#   push v*.*.*   → prod    → node scripts/use-env.js production → .env.production
+#   push main     → stage   → node scripts/use-env.js staging → env/staging → .env
+#   push v*.*.*   → prod    → node scripts/use-env.js production → env/production → .env
 #
 # 手动触发 workflow_dispatch：
-#   - dev：内部测试包，使用 .env.development
-#   - stage：仅用于 main / master 补跑 Staging release，使用 .env.staging
+#   - dev：内部测试包，使用 env/development
+#   - stage：仅用于 main / master 补跑 Staging release，使用 env/staging
 #   - prod：用于 vMAJOR.MINOR.PATCH tag，或在 main / master 上填写 version 后发正式 Release
 #
 # Repository secrets（与 android-release.yml 共用同一套即可）：
@@ -140,6 +140,12 @@ jobs:
             stage) node scripts/use-env.js staging ;;
             *)     node scripts/use-env.js development ;;
           esac
+          for legacy in .env.production .env.staging .env.development; do
+            if [ -f "$legacy" ]; then
+              echo "::error::Legacy $legacy must not exist at app-expo root (overrides .env on Release builds)."
+              exit 1
+            fi
+          done
 
       - name: Determine version
         id: version