docs(notebook): fix RF-DETR model ID in basketball AI tutorial

[BillionClaw]

Fixes #431

Problem

The basketball AI tutorial notebook was using model ID basketball-player-detection-3-ycjdo/4 which corresponds to YOLOv11s, but the tutorial is documented as using RF-DETR.

Solution

Changed the model ID to basketball-player-detection-3-ycjdo/13 which corresponds to rfdetr-medium, matching the documented RF-DETR architecture.

Verification

• Model ID updated from /4 (YOLOv11s) to /13 (rfdetr-medium)
• No other changes required as get_model() handles different architectures automatically

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[lgx0319]

Friendly bump -- this PR has been open for a while. Happy to make any changes if needed, or close it if no longer relevant.