Fix pyannote 4.x DiarizeOutput API (no itertracks)

Fix pyannote diarize path: use_auth_token -> token

Target A100 40GB runtime (AWQ Int4 thinker, no offload)

AWQ Int4 + Thinker-only load to fit L4 24GB

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L4 24GB: max_memory CPU offload + sdpa default for model load

Fix UnboundLocalError in attn_candidates dedup (transformers_qwen.py)

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