[Junie]: feat(ci): add root workflow for PyPI publishing

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• 🔗 Issue: Fixes: Junie: Add a GitHub workflow to automatically publish new PyPI packages based on pushes and merges to the main branch. #16
• ⚙️ Trigger: Issue

📊 Junie Summary

Added a root-level GitHub Actions workflow to publish PyPI packages with safety checks. Workflow triggers on main branch pushes and requires manual file move and secret setup. Duplicate uploads are avoided.

[Tryanks]

@jetbrains-junie Please help me modify it to update PyPI automatically based on commit tags. This means that merely merging or pushing is not enough to trigger the current workflow; a tag must also be pushed. Only then will a new PyPI package be created based on the latest tag.

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feat(ci): trigger PyPI publish only on tag pushes

The publishing workflow was updated to trigger only on Git tag pushes and moved to the standard GitHub Actions workflow directory. Safety checks ensure the workflow runs only on the canonical repository and tag refs. Instructions were provided for maintainers on token setup and release flow.

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