fix(diffusers): pass text prompts by keyword - #11836
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FLUX.2 pipelines accept image as their first positional argument, so passing a text prompt positionally leaves prompt unset and fails generation. Use the named prompt parameter and cover the FLUX.2-compatible signature with a focused regression test. Assisted-by: Codex:gpt-5 Signed-off-by: pengmin <minpeng@semigraph.com>
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Fixes #11833
Pass text-to-image prompts using the named prompt argument. FLUX.2 pipelines accept image as their first positional argument, so the previous call left prompt unset and failed generation.
Validation: python -m compileall -q backend.py test.py; ruff check backend.py test.py --select F821; git diff --check. The focused pytest cannot run in this Windows environment because torch and diffusers are not installed. The added regression test models the FLUX.2-compatible signature. AI assistance is attributed in the commit trailer.