fix: enable uv to install the ghscope CLI entrypoint

[nazarli-shabnam]

closes #9

[Copilot]

Pull request overview

This PR updates the project configuration so uv treats ghscope as an installable package, which allows uv run ghscope ... to resolve the ghscope console script defined in pyproject.toml (closing #9).

Changes:

• Add a PEP 517 [build-system] using hatchling so the project can be built/installed.
• Enable uv packaging via [tool.uv] package = true so uv sync installs the project (and its console script).
• Update uv.lock to reflect the project being installed from the repo as an editable source.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
pyproject.toml	Adds build backend + uv packaging config so uv installs the project and exposes the ghscope CLI entrypoint.
uv.lock	Updates the local ghscope package source to editable = ".", consistent with uv installing the project into the environment.

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[nazarli-shabnam]