Add one-shot workflow to close the Comunity Release milestone (issue 13) - #14

Task issue_13 "Comunity Release"

Issue #13 asks to close the "Comunity Release" milestone with all its issues.
The QuasarAppCI bot account only has read (pull) access on this repository
(no triage / maintain / push), so it cannot close issues or manage labels
directly:

• GraphQL closeIssue -> "QuasarAppCI does not have the correct permissions to execute CloseIssue"
• REST PATCH /issues/{n} (state=closed) -> 403 "Must have admin rights to Repository"

This PR adds a one-shot, manually triggered workflow
.github/workflows/close-community-release.yml that runs with the repository
GITHUB_TOKEN (issues: write, milestones: write) and:

1. prints the effective token permissions (diagnostic),
2. closes every open issue of milestone Improve rust speed #1 ("Comunity Release": currently Update readme #8, Change Liense to LGPLv3 #9, Implement GitHub Page #12, Comunity Release #13 — Implement Github Actions #7 was already closed),
3. closes milestone Improve rust speed #1 itself,
4. prints the final state of all milestone issues and the milestone.

Usage (maintainer):

1. Merge this PR.
2. Actions -> "Close Community Release Milestone" -> Run workflow.
3. Check the final-state log — milestone Improve rust speed #1 and all its issues are closed.

The workflow is workflow_dispatch-only (never runs automatically) and can be
deleted from the repository after the first successful run.

Alternative: grant the QuasarAppCI account maintain permission on the
repository and the agent will close the issues and milestone directly in the
next cycle (no workflow needed).