docs: describe recorded profiles during bag playback

docs/en/source/camera_devices/4_application_guide/launch_parameters.md

@@ -108,6 +108,7 @@ The following are the launch parameters available:
   * Record device data to the specified SDK `.bag` file after startup. Leave empty to disable automatic recording. When recording starts, a JSON preset file with the same base name is also exported, for example `record.bag` creates `record.json`.
 * **`bag_filename`**
   * Play back the specified SDK `.bag` file. When set, the node creates a playback device from the bag file instead of connecting to a physical camera.
+  * During playback, image and IMU streams use the profiles recorded in the bag file. The launch parameters do not select new image resolution, frame rate, format, or IMU range/sample rate profiles.
 * **`bag_loop`**
   * Loop SDK bag playback after the file reaches the end. Default: `false`. This only takes effect when `bag_filename` is set.
 * **`enable_fps_boost`**

docs/zh/source/camera_devices/4_application_guide/launch_parameters.md

@@ -108,6 +108,7 @@
   * 启动后使用 SDK 录制设备数据到指定 `.bag` 文件。为空时不自动录制。开始录制时会同时导出同名 JSON preset 文件，例如 `record.bag` 对应 `record.json`。
 * **`bag_filename`**
   * 使用 SDK 回放指定 `.bag` 文件。设置后节点从 bag 文件创建回放设备，而不是连接真实相机。
+  * 回放时图像和 IMU 流使用 bag 文件中录制的 profile，不会根据启动参数重新选择图像分辨率、帧率、格式或 IMU 的量程/采样率。
 * **`bag_loop`**
   * SDK bag 回放结束后是否循环播放。默认值：`false`。仅在设置 `bag_filename` 时生效。
 * **`enable_fps_boost`**