Update README to use the canonical GitHub Actions badge for the Main workflow

[Copilot]

The README workflow badge was using the workflow file path URL. This updates it to the canonical badge endpoint for the Main workflow so the badge aligns with the repository’s actual workflow metadata.

• README badge
  • Keep the existing workflow page link
  • Replace the badge image source with the canonical Main workflow badge URL
  • Add alt text for the badge image

<a href="https://github.com/phuquoc81/Fastcash/actions/workflows/main.yml">
  <img src="https://github.com/phuquoc81/Fastcash/workflows/Main/badge.svg" alt="Main workflow status">
</a>

• Scope

  • Single-line change in README.md
  • No workflow logic or application code changes

• Screenshot

  • https://github.com/user-attachments/assets/48d9af06-17d0-4a9e-86ec-1f11c40e2415

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