chore: enable erasableOnly in lint

[jubinsoni]

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Summary

for : #27998

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 @jubinsoni, 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 updates the project's ESLint configuration to enforce a new coding standard. It specifically introduces a rule that prohibits the declaration of TypeScript enums, aiming to guide developers towards alternative patterns for defining constant sets and improve code consistency.

Highlights

• ESLint Rule Addition: A new ESLint rule has been added to web/eslint.config.mjs to restrict the use of TypeScript enums.
• Enum Restriction: The no-restricted-syntax rule now disallows TSEnumDeclaration with an error message "We should not use Enum".

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[gemini-code-assist]

Code Review

This pull request introduces a new ESLint rule to disallow the use of enum in the codebase. This is a good step towards standardizing on alternatives like union types, which can offer benefits in terms of bundle size and type safety. My review includes a suggestion to improve the error message for this new rule to make it more descriptive and helpful for developers, explaining the rationale and suggesting the preferred alternative.

[hyoban]

Use erasableOnly preset with https://eslint.org/blog/2025/04/introducing-bulk-suppressions/