support wan2.6 video enableOverlays params

[mose-zm]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @mose-zm, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the video synthesis capabilities by introducing support for the enableOverlays parameter within the VideoSynthesisParam class. This addition allows users to explicitly control whether overlays are enabled in the generated videos, providing greater flexibility and aligning the client library with the wan2.6 video synthesis API specifications. The change primarily involves adding a new field, defining its API keyword, and ensuring its proper serialization in outgoing requests.

Highlights

• New Parameter Introduction: A new enableOverlays boolean parameter has been added to the VideoSynthesisParam class, allowing control over overlay functionality in video synthesis requests.
• API Keyword Definition: A corresponding ENABLE_OVERLAYS constant has been defined in ApiKeywords.java to ensure consistent key usage for the new parameter in API requests.
• Parameter Serialization: The getParameters method in VideoSynthesisParam has been updated to include the enableOverlays value in the request payload when it is not null, facilitating its transmission to the video synthesis service.

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[gemini-code-assist]

Code Review

This pull request adds support for the enableOverlays parameter for video synthesis. The changes correctly introduce a new field in VideoSynthesisParam, a corresponding constant in ApiKeywords, and integrate it into the request parameters. The implementation is sound, but I have one suggestion to improve the Javadoc for the new parameter to make it more descriptive for future maintainability.

[gemini-code-assist]

The Javadoc for enableOverlays is a bit terse as it only repeats the parameter name. It would be more helpful for code clarity and maintainability to describe what this parameter actually does, for example, by explaining that it controls whether overlays are enabled on the generated video.

Suggested change

	/** The enable_overlays parameter. */
	/** Specifies whether to add overlays to the synthesized video. */