docs(web): add corepack recommendation

[hyoban]

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Summary

Fixes #30836

Screenshots

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Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran make lint and make type-check (backend) and cd web && npx lint-staged (frontend) to appease the lint gods

[gemini-code-assist]

Summary of Changes

Hello @hyoban, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the web frontend's README.md by introducing a recommendation for Corepack. The primary goal is to streamline the development environment setup by guiding users to leverage Corepack for consistent and automated package manager version management, ultimately improving the onboarding experience for contributors.

Highlights

• Documentation Update: Added a new section to the web/README.md file recommending the use of Corepack.
• Corepack Recommendation: The documentation now suggests installing and enabling Corepack to automatically manage package manager versions, specifically for npm and pnpm.

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[gemini-code-assist]

Code Review

This pull request adds a recommendation to use Corepack in the web/README.md file. This is a good addition as the project uses a specific version of pnpm defined in package.json. My feedback focuses on simplifying the instructions, as Corepack is already bundled with the required Node.js version and only needs to be enabled.

[Copilot]

Pull request overview

This PR adds documentation recommending the use of Corepack for managing package manager versions in the web frontend README.

Changes:

• Added a tip section recommending Corepack installation and enablement after the Node.js and pnpm requirements

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