Modernize packaging, tooling, and docs for ec_tools

[indestinee]

• Migrate to pyproject.toml + uv.lock, drop setup.py, add .python-version.
• Refresh README.md with usage examples, layout, and development notes.
• Tidy exports via all, minor formatting tweaks, and requirements update (add colorama).
• Update pre-commit hooks and configs; clean trailing blank lines.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Discover packages from the project root

Setting where = ["ec_tools"] makes setuptools search inside the ec_tools/ directory as the package root, so the built distribution will not include the top-level ec_tools package (it resolves subpackages like data, database, etc. as top-level names instead). In an installed wheel/sdist, imports used throughout this repo and README (for example import ec_tools.database) will fail, which breaks consumers after publishing.

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