fix: video column type compatible

[Nexisato]

Description

• Revert Video type to column_image for compatible field

Test Code

import swanlab

if __name__ == "__main__":
    swanlab.init(project="demo-charts-test", name="video-chart-test")

    swanlab.log({"video": swanlab.Video("./demo.gif", caption="test caption")})

    swanlab.finish()

📊 Demo Runs:

• Image Type: nexisato/demo-charts-test/runs/c7e7ozl2/chart
• Video Type: nexisato/demo-charts-test/runs/ls17l20a/chart

TODO: docs (url ref)

[gemini-code-assist]

Code Review

This pull request temporarily changes the column type for video data from ColumnType.COLUMN_TYPE_VIDEO to ColumnType.COLUMN_TYPE_IMAGE in both the video transform implementation and its corresponding unit test, adding TODO comments to revert this change once the server supports the VIDEO column type. I have no feedback to provide as there are no review comments.

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