chore(lint): Use shared eslint config

[fb55]

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[Copilot]

Pull request overview

This pull request migrates from the legacy ESLint configuration format (.eslintrc.json) to the modern flat config format (eslint.config.mjs) using a shared configuration from @feedic/eslint-config. The changes also introduce Biome as an additional formatter/linter and upgrade ESLint from v8 to v10.

Changes:

• Upgraded ESLint from v8.57.1 to v10.0.1 and adopted flat config format
• Added shared ESLint configuration via @feedic/eslint-config package
• Introduced Biome (v2.4.4) for additional formatting/linting
• Applied automated code fixes (parentheses for operator precedence, modern array methods)

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
package.json	Updated dependencies (ESLint v10, removed Prettier, added Biome and shared config), reorganized scripts, added "type": "commonjs" field
package-lock.json	Dependency lock file updates reflecting new package versions and added/removed dependencies
eslint.config.mjs	New flat ESLint configuration file using shared config and TypeScript rules
biome.json	New Biome configuration for formatting and linting
.eslintrc.json	Removed legacy ESLint configuration
.eslintignore	Removed (replaced by config in flat config file)
.prettierignore	Removed (Prettier replaced by Biome)
src/index.ts	Added parentheses around modulo operations for clarity, renamed loop variables
src/index.spec.ts	Modernized code using Array.from() and .entries()

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