[recipe, doc] chore: default Wan2.2 DanceGRPO docs to v1 and deprecate v0

[knlnguyen1802]

After #466, CUDA DanceGRPO should start from the V1 sync recipe. Point every user-facing doc at run_wan22_5b_t2v_hpsv3_v1.sh and mark the v0 auto-detect launcher deprecated for CUDA (NPU still uses it).

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[SamitHuang]

It's too trivial. Let annouce it once all models switch to v1 trainer