Merge pull request #2088 from tzz-radxa/docs/q900-download-os-clarify-20260903

docs(airbox-q900): clarify OS type of system image downloads

Author: Milir-Radxa

docs/fogwise/airbox-q900/download.md

@@ -6,9 +6,16 @@ sidebar_position: 150
 
 ## 系统镜像
 
-- [radxa-airbox-q900_noble_gnome_r1](https://dl.radxa.com/fogwise/airbox-q900/images/radxa-airbox-q900_noble_gnome_r1_4096.tar.gz)
+- [radxa-airbox-q900_noble_gnome_r1](https://dl.radxa.com/fogwise/airbox-q900/images/radxa-airbox-q900_noble_gnome_r1_4096.tar.gz)：Ubuntu 24.04（Noble）+ GNOME 桌面系统镜像（r1 稳定版）
 
-- [qcs9075-provision](https://dl.radxa.com/fogwise/airbox-q900/images/qcs9075-provision.tar.gz)
+:::note 镜像命名说明
+
+- `noble` 表示 Ubuntu 24.04（Noble Numbat）操作系统，`gnome` 表示 GNOME 桌面环境
+- 前缀 `r` 表示稳定版（如 r1），前缀 `t` 表示测试版（如 t1）
+
+:::
+
+- [qcs9075-provision](https://dl.radxa.com/fogwise/airbox-q900/images/qcs9075-provision.tar.gz)：UFS 配置工具包（非操作系统镜像），用于安装系统到板载 UFS 前的存储配置步骤。完整安装步骤请参考[安装系统到板载 UFS](./getting-started/install-system/onboard-ufs)
 
 ## 百度网盘下载
 

i18n/en/docusaurus-plugin-content-docs/current/fogwise/airbox-q900/download.md

@@ -6,9 +6,16 @@ sidebar_position: 150
 
 ## System Images
 
-- [radxa-airbox-q900_noble_gnome_r1](https://dl.radxa.com/fogwise/airbox-q900/images/radxa-airbox-q900_noble_gnome_r1_4096.tar.gz)
+- [radxa-airbox-q900_noble_gnome_r1](https://dl.radxa.com/fogwise/airbox-q900/images/radxa-airbox-q900_noble_gnome_r1_4096.tar.gz): Ubuntu 24.04 (Noble) + GNOME desktop system image (r1 stable release)
 
-- [qcs9075-provision](https://dl.radxa.com/fogwise/airbox-q900/images/qcs9075-provision.tar.gz)
+:::note Image naming convention
+
+- `noble` refers to the Ubuntu 24.04 (Noble Numbat) operating system, `gnome` refers to the GNOME desktop environment
+- The `r` prefix indicates a stable release (e.g. r1), while the `t` prefix indicates a test release (e.g. t1)
+
+:::
+
+- [qcs9075-provision](https://dl.radxa.com/fogwise/airbox-q900/images/qcs9075-provision.tar.gz): UFS provisioning toolkit (not an OS image), used for the storage provisioning step before installing the system to the onboard UFS. For the full installation steps, see [Install System to Onboard UFS](./getting-started/install-system/onboard-ufs)
 
 ## Software Tools