docs: add CI status badge to README

[Boulea7]

Summary by Sourcery

Documentation:

• Display the GitHub Actions CI status badge in both the main and English README files.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds a GitHub Actions CI status badge to both the main and English README files, linking to the existing ci.yml workflow.

File-Level Changes

Change	Details	Files
Expose CI workflow status via badges in documentation headers.	Insert a CI status shield.io-style badge in the badge row near the top of the primary README. Insert the same CI status badge in the badge row of the English README, keeping consistent ordering with existing badges. Link both badges to the GitHub Actions ci.yml workflow page for quick access to run details.	README.md README_EN.md

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