ci: add stale workflow for inactive issues and PRs

[yankay]

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[Copilot]

Pull request overview

Adds an automation workflow to mark inactive issues and pull requests as “stale” and close them after a grace period.

Changes:

• Introduces a scheduled + manually triggerable GitHub Actions workflow for stale issue/PR management
• Configures separate stale/close timelines for issues vs PRs
• Adds automated stale/close messages for issues and PRs

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[Copilot]

actions/stale@v9 expects a repo-token input; without it the workflow typically fails at runtime with a missing required input error. Add repo-token: ${{ secrets.GITHUB_TOKEN }} (or ${{ github.token }}) under the with: block so the action can authenticate to label/close issues and PRs.

Suggested change

	with:
	with:
	repo-token: ${{ secrets.GITHUB_TOKEN }}