feat: 支持 MJPEG 解码与 MSD 目录配置

- FFmpeg/hwcodec 增加 RKMPP MJPEG 解码与 RAM FFI，ARM 构建启用对应解码器
  - 共享视频管线新增 MJPEG 解码路径（RKMPP/TurboJPEG），优化 WebRTC 发送与 MJPEG 去重
  - MSD 配置改为 msd_dir 并自动创建子目录，接口与前端设置同步更新
  - 更新包依赖与版本号

web/src/i18n/en-US.ts

@@ -502,6 +502,11 @@ export default {
     notAvailable: 'Not available',
     msdEnable: 'Enable MSD',
     msdEnableDesc: 'Enable to mount ISO images and virtual drives to the target machine',
+    msdCh9329Warning: 'HID backend is CH9329, MSD is unavailable',
+    msdCh9329WarningDesc: 'CH9329 is a serial HID backend and does not support USB Gadget MSD',
+    msdDir: 'MSD directory',
+    msdDirDesc: 'MSD base directory containing images/ and ventoy/ subfolders',
+    msdDirHint: 'Changing this rebuilds MSD and updates console capacity stats',
     willBeEnabledAfterSave: 'Will be enabled after save',
     disabled: 'Disabled',
     msdDesc: 'Mass Storage Device allows you to mount ISO images and virtual drives to the target machine. Use the MSD panel on the main page to manage images.',