feat: update Rstack slogan

[chenjiahan]

This PR updates the Rstack slogan to emphasize its unified modern toolchain positioning, performance focus, and readiness for the age of AI. It refreshes both the English and Chinese copy in the ToolStack component.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 8174dc5e-09c6-428a-b895-c9c22884eb85

📥 Commits

Reviewing files that changed from the base of the PR and between 9a0ce29 and 5e89646.

📒 Files selected for processing (1)

• src/tool-stack/index.tsx

📝 Walkthrough

Walkthrough

Updated the ToolStack component’s English and Chinese subtitle strings to replace the previous high-performance and consistent-architecture wording with copy emphasizing speed optimization and the AI era.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: updating the Rstack slogan copy.
Description check	✅ Passed	The description is directly related to the ToolStack slogan update in English and Chinese.
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 chenjiahan/feat-update-rstack-slogan

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