fix: SDPose - resize input always

[kijai]

The model can't handle too large images, so it should force resize the input always, currently it's only done when using bboxes. Also fixed small error in the heatmap postprocessing, to make it match the original cv2 method better, and added batching to RT-DETR as it would OOM on huge amount of input frames.

And also added support for the intermediate dtype on the pose drawing node.

Issue brought up by a user here:
#12661 (comment)

[coderabbitai]

📝 Walkthrough

Walkthrough

Three modules received refinements to pose estimation and detection inference. In the Gaussian blur operation of pose heatmap processing, the truncation parameter was explicitly set to 2.5. In RT-DETR detection inference, execution was restructured to process batches in 32-item sub-batches instead of processing the entire input at once. In SDPose keypoint extraction, device and dtype handling was added, two helper functions were introduced for image resizing and keypoint coordinate remapping, and VAE encoding calls were refactored to work with resized images across different processing modes.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 42.86% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: forcing SDPose to always resize input, which is the primary modification across the changed files.
Description check	✅ Passed	The pull request description clearly explains the changes: force-resizing inputs for SDPose, fixing heatmap postprocessing, adding RT-DETR batching, and supporting intermediate dtype in the pose drawing node.

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