docs(nanokvm-go): add introduction and user guide media

docs/hardware/en/kvm/NanoKVM_Go/introduction.md

@@ -11,7 +11,7 @@ update:
 
 ## Introduction
 
-![NanoKVM Go appearance](./../../../assets/NanoKVM/go/introduction/device-transparent.webp)
+![NanoKVM Go appearance](./../../../assets/NanoKVM/go/introduction/nanokvm-go-device.jpg)
 
 NanoKVM Go is a portable IP-KVM tool in the NanoKVM series, designed for mobile maintenance, temporary access, and remote operation scenarios. It connects to the controlled device through USB-C and lets you view the screen, control keyboard and mouse input, and perform remote access from a browser.
 
@@ -32,6 +32,8 @@ Unlike traditional remote desktop software, NanoKVM Go does not require remote s
 
 ## Use Cases
 
+![NanoKVM Go use cases demo](./../../../assets/NanoKVM/go/introduction/nanokvm-go-use-cases.gif)
+
 + Server management: remotely view the target host screen and control keyboard and mouse input;
 + Remote installation: enter BIOS/UEFI, adjust boot options, and install systems with mounted images;
 + Troubleshooting: continue hardware-level maintenance when remote desktop, SSH, or system services are unavailable;

docs/hardware/en/kvm/NanoKVM_Go/user_guide.md

@@ -114,6 +114,8 @@ The floating toolbar entries from left to right are: Image Settings, Portrait Mo
 
 Click the Image Settings icon on the left side of the floating toolbar to adjust remote image encoding, display parameters, and clarity. New users are advised to keep the default settings first, and adjust the following options only when the image is laggy, unclear, or the resolution does not match.
 
+![NanoKVM Go image settings demo](./../../../assets/NanoKVM/go/user_guide/nanokvm-go-image-settings.gif)
+
 + Video Mode is used to select the video encoding and transmission method. In most cases, `H.264 WebRTC` is recommended for better compatibility. In a stable local network, Direct mode can also be tried if needed.
 
 + EDID is used to select the display parameters that NanoKVM Go provides to the controlled host. After the host reads the EDID, it outputs the corresponding resolution and refresh rate, such as `3840 x 2160 30Hz`, `2560 x 1440 60Hz`, or `1920 x 1080 60Hz`. After changing EDID, the host image may briefly go black or re-detect the display. This is normal.

docs/hardware/zh/kvm/NanoKVM_Go/introduction.md

@@ -11,7 +11,7 @@ update:
 
 ## 简介
 
-![NanoKVM Go 外观](./../../../assets/NanoKVM/go/introduction/device-transparent.webp)
+![NanoKVM Go 外观](./../../../assets/NanoKVM/go/introduction/nanokvm-go-device.jpg)
 
 NanoKVM Go 是 NanoKVM 系列中的便携式 IP-KVM 工具，面向随身维护、临时接入和远程运维场景。它通过 USB-C 接入被控设备，将画面查看、键鼠控制和远程访问集中到浏览器中完成。
 
@@ -23,6 +23,8 @@ NanoKVM Go 是 NanoKVM 系列中的便携式 IP-KVM 工具，面向随身维护
 
 ## 使用场景
 
+![NanoKVM Go 使用场景演示](./../../../assets/NanoKVM/go/introduction/nanokvm-go-use-cases.gif)
+
 + 服务器管理：远程查看目标主机画面，并进行键盘、鼠标操作；
 + 远程装机：进入 BIOS/UEFI，调整启动项，配合镜像完成系统安装；
 + 故障排查：当远程桌面、SSH 或系统服务不可用时，通过硬件级画面继续维护；

docs/hardware/zh/kvm/NanoKVM_Go/user_guide.md

@@ -114,6 +114,8 @@ NanoKVM Go 首次使用或更换 Wi-Fi 环境时，需要先完成网络配置
 
 点击悬浮栏左侧的图像设置图标，可调整远程画面的编码、显示参数和清晰度。新手用户建议优先保持默认设置；当画面卡顿、清晰度不足或分辨率不匹配时，再按需调整以下选项。
 
+![NanoKVM Go 图像设置演示](./../../../assets/NanoKVM/go/user_guide/nanokvm-go-image-settings.gif)
+
 + 视频模式用于选择视频编码和传输方式。一般情况下建议使用 `H.264 WebRTC`，兼容性较好；在网络稳定的局域网环境中，也可以按需尝试 Direct 模式。
 
 + EDID 用于选择 NanoKVM Go 向被控主机提供的显示器参数。主机读取 EDID 后，会根据该参数输出对应的分辨率和刷新率，例如 `3840 x 2160 30Hz`、`2560 x 1440 60Hz` 或 `1920 x 1080 60Hz`。修改 EDID 后，主机画面可能会短暂黑屏或重新识别显示器，属于正常现象。