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b800f828 - [docs] FLUX.3: modular-only notes, lazy loading, callbacks (#15069)

[docs] FLUX.3: modular-only notes, lazy loading, callbacks (#15069) * [docs] FLUX.3: modular-only notes, lazy loading, callbacks Add a tips callout on what differs from DiffusionPipeline (lazy loading, outputs, guider, offloading, editing blocks), move the prompting advice into the upsampling section with the pop-the-step example, and add a per-step callbacks section with a block that takes callback_on_step_end. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> * [docs] FLUX.3: callback block walks all denoising loops Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> * [docs] modular: add "Coming from DiffusionPipeline" to the quickstart and move per-step callbacks to the callbacks guide Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> * [docs] FLUX.3: show the upsampled caption; clarify the index note in the quickstart Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> * [docs] modular: make "Coming from DiffusionPipeline" its own page Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> --------- Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>