[docs] update philosophy.md (finally) (#13808)
* [docs] refresh philosophy.md for current conventions
Update the framing to match how Diffusers actually works now: models
follow the single-file policy (with UNet/older transformers as legacy
exceptions, not the model), add a Modular Pipelines section parallel to
standard Pipelines, and slim Pipelines/Models bullets to remove stale
guidance (per-task pipeline subclassing, generic-class checkpoint
adaptation, dead links to deprecated repos).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
* Update docs/source/en/conceptual/philosophy.md
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
* Apply suggestions from code review
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
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Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
