build: switch to hatch-vcs for automatic git-tag versioning

[PythonFZ]

Summary

• Replace static version = "0.2.2" with dynamic versioning via hatch-vcs (git tags)
• Add [tool.hatch.version] and [tool.hatch.build.hooks.vcs] config to pyproject.toml
• Update publish workflow with separate build/upload jobs and fetch-depth: 0 for full git history
• Add generated src/molify/_version.py to .gitignore

Same build system as zincware/asebytes#15.

Test plan

• uv build produces correctly versioned wheel and sdist
• All 439 tests pass
• _version.py is generated and gitignored
• Verify PyPI publish workflow on next release

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 76ea42dc-0bb3-4d15-8880-b3c3598f8e10

📥 Commits

Reviewing files that changed from the base of the PR and between a1d86eb and fc7b27e.

⛔ Files ignored due to path filters (1)

• uv.lock is excluded by !**/*.lock

📒 Files selected for processing (3)

• .github/workflows/build-wheels.yaml
• .gitignore
• pyproject.toml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch build/hatch-vcs

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