docs: unify README badges

[han-xudong]

Summary\n\n- standardize workflow, coverage, release, runtime, and license badge presentation\n- use explicit main-branch workflow and coverage status\n\n## Validation\n\n- verified every badge image and link returns HTTP 200\n- verified the license badge renders Apache-2.0

Summary by CodeRabbit

• Documentation
  • Updated README status badges for CI, CodeQL, coverage, licensing, and C++17 support.
  • Refined badge links and labels to reflect the main branch and current project information.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: d6f721a2-eb33-49d8-bc7b-3018efccc12a

📥 Commits

Reviewing files that changed from the base of the PR and between e424c40 and 73f13bc.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README’s CI, CodeQL, coverage, license, and C++17 status badge URLs were updated, including branch-specific parameters where applicable.

Changes

README badge updates

Layer / File(s)	Summary
Update status badge links README.md	Revises badge URLs and labels for CI, CodeQL, coverage, license, and C++17 while leaving the rest of the README unchanged.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the README badge cleanup and is specific enough for the main change.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/unify-readme-badges

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_{Comment @coderabbitai help to get the list of available commands.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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