Migrate dependency management to pyproject.toml

[mslaffin]

Enforces Python 3.11 using pyproject.toml and its requires-python field.
Closes #114

Changes:

• Add pyproject.toml to declare project dependencies. Sets py-modules = [] since the main project is a runnable app, not an importable library.
• remove requirements.txt, since all deps and their pins are in the .toml
• update README

On Python 3.11 (installs all deps as before):

(venv) PS C:\Users\Michael\temp\EBEAM_dashboard> pip install -e .
Obtaining file:///C:/Users/Michael/temp/EBEAM_dashboard
  Installing build dependencies ... done
  Checking if build backend supports build_editable ... done

When attempting to build on any other Python version:

(venv) PS C:\Users\Michael\temp\EBEAM_dashboard> pip install -e .
Obtaining file:///C:/Users/Michael/temp/EBEAM_dashboard
  Installing build dependencies ... done
  Checking if build backend supports build_editable ... done
  Getting requirements to build editable ... done
  Preparing editable metadata (pyproject.toml) ... done

ERROR: Package 'ebeam-dashboard' requires a different Python: 3.13.13 not in '<3.12,>=3.11'

[chatgpt-codex-connector]

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[bwalkerMIR]

Thanks @mslaffin this is great!! We should catch up again some time there is a lot happening! We're getting close to melting metal soon.

[bwalkerMIR]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. 🎉

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