修改create_config.sh脚本，允许邮箱输入留空并设置默认值

bin/create_config.sh

@@ -16,11 +16,10 @@ create_config_with_tls_cert() {
     bash "$script_dir/update_obfs_password.sh"
 
     # 获取邮箱
-    read -p "请输入你的邮箱: " user_email
-    while [[ -z "$user_email" ]]; do
-        echo "[错误] 邮箱不能为空"
-        read -p "请输入你的邮箱: " user_email
-    done
+    read -p "请输入你的邮箱(可留空): " user_email
+    if [[ -z "$user_email" ]]; then
+        user_email="example@example.com"
+    fi
     
     # 获取域名
     read -p "请输入你的域名 (例如: example.com): " user_domain