Fix: diffusers from git main for Flux2KleinPipeline, low_cpu_mem_usage=False, no cpu_offload

Fix: compat import Flux2Pipeline, low_cpu_mem_usage=False, no enable_model_cpu_offload

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Fix total_mem -> total_memory attribute name

Add v6 training script: FLUX.2-klein-4B with proper token validation

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initial commit