chore: rename oasis to galacean in README badges and links

[luo2430]

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Summary by CodeRabbit

• Documentation
  • Updated package badges and links in the README files to reflect the new @galacean/engine-toolkit package name.
  • Kept the rest of the documented content unchanged.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: a506f529-dd71-4c30-a815-b11497ebe78d

📥 Commits

Reviewing files that changed from the base of the PR and between 1c10ae5 and c71d152.

📒 Files selected for processing (2)

• README.md
• packages/galacean-engine-toolkit/README.md

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Walkthrough

Both README files update their top npm badge/link lines to point to @galacean/engine-toolkit instead of oasis-engine-toolkit.

Changes

README badge metadata

Layer / File(s)	Summary
Header badge links README.md, packages/galacean-engine-toolkit/README.md	Both top README badge/link lines now reference @galacean/engine-toolkit and the matching badge targets.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 I hopped past the old badge trail,
To shiny new links that never fail.
Two READMEs now sing in tune,
With @galacean/engine-toolkit by noon.
Thump-thump! 🥕

🚥 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 and link rename from oasis-engine-toolkit to galacean-engine-toolkit.
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

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