Add PersonalizeU scaffolding for backend and frontend flows

[JeremyBrown34]

Summary

• scaffold a FastAPI backend with routers for character, setting, and shot flows
• add frontend view-model placeholders for character builder, setting builder, and shot director experiences
• replace the README with project goals, structure, and run instructions; add requirements and gitignore

Testing

• python -m compileall src

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Codex Task

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

README start command cannot import package

The documented run command uvicorn personalizeu.backend.app:app --reload fails when executed from the repo root after only installing requirements.txt, because personalizeu lives under src/ and the repository has no pyproject.toml/setup.cfg to put src on sys.path. With the default working directory, Python cannot resolve the package and uvicorn aborts with ModuleNotFoundError: No module named 'personalizeu'. The run instructions need to add PYTHONPATH=src (or install the package) so the server can start.

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