Add support for RF-DETR base model from HuggingFace (Roboflow)

[headertag]

Is your feature request related to a problem? Please describe.
I want to use the RF-DETR base model from HuggingFace (Roboflow) in this repository to leverage modern transformer-based object detection capabilities.

Describe the solution you'd like
Integrate the RF-DETR base model available at https://huggingface.co/Roboflow/rf-detr-base using the HuggingFace Transformers API. Provide code/documentation for:

• Model loading from HuggingFace
• Inference pipeline setup
• Integration examples within the repo's workflows

Describe alternatives you've considered

• Integrating other object detection models instead of RF-DETR
• Manual/standalone implementation without HuggingFace Hub

Additional context
Official model card: https://huggingface.co/Roboflow/rf-detr-base
The model supports both PyTorch and ONNX formats.