有 .ctms-env 配置时直接展示部署环境，跳过选择菜单

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

install.sh

@@ -170,13 +170,15 @@ ctms_config_get() {
 }
 
 pick_env() {
-  local env default_index=0
+  local env
   env="$(ctms_config_get "env" || true)"
-  case "$env" in
-    main)    default_index=1 ;;
-    release) default_index=2 ;;
-    *)       default_index=0 ;;
-  esac
+  if [[ -n "$env" ]]; then
+    ctms_require_env "$env"
+    SELECTED_ENV="$env"
+    ctms_info "部署环境: ${C_BOLD}${env}${C_RESET}（来自 .ctms-env）"
+    return
+  fi
+  local default_index=0
   select_menu "选择环境" "$default_index" \
     "dev       本地开发环境      Vite 热加载 / 默认密钥" \
     "main      内网测试环境      预发布验证 / 生产模式" \