feat(action): add offline input to skip remote API calls

[WillHen]

When running React Doctor in GitHub Actions, there's no way to disable publishing diagnostics to the react.doctor API. This is a problem for orgs where react.doctor is blocked by network security policies, self-hosted runners without external internet access, or teams that simply want local-only scoring.

Changes

• Add offline input to action.yml (default "false") — passes the existing --offline CLI flag when set to "true"
• Wire --offline into both the main scan step and the score extraction step
• Add offline and fail-on (previously missing) to the README inputs table

Usage

- uses: millionco/react-doctor@main
  with:
    offline: "true"
    diff: main

When offline is enabled, scores are calculated locally instead of via the remote API. All scanning behavior remains identical — only the score API calls are skipped.

[vercel]

@WillHen is attempting to deploy a commit to the Million Team on Vercel.

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