Support deployment of RFDETRKeypointPreview weights

[sergii-bond]

What does this PR do?

Adds support to make this work:

deploy_model = RFDETRKeypointPreview.from_checkpoint(DEPLOY_CHECKPOINT_PATH)
deploy_model.deploy_to_roboflow(...)

Type of Change

• New feature (non-breaking change that adds functionality)

Testing

• I have tested this change locally
• I have added/updated tests for this change

Test details:

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code where necessary, particularly in hard-to-understand areas
• My changes generate no new warnings or errors
• I have updated the documentation accordingly (if applicable)

Additional Context

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	pypi/​numpy@​2.5.0 ⏵ 2.3.5	+1
	pypi/​matplotlib@​3.11.0 ⏵ 2.2.5	+6				+10

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