Replace ESLint/Prettier with oxlint/oxfmt

[venables]

Summary

• Replace ESLint and Prettier with oxlint and oxfmt for linting and formatting across the monorepo
• Remove per-package eslint.config.js files and the @repo/eslint-config internal package — linting now runs from root
• Fix all oxlint errors (13 fixes: any → unknown, curly braces, @auth tags) and configure no-unused-vars with ^_ ignore pattern
• Remove baseUrl from 8 tsconfig.json files (unnecessary with bundler resolution)
• Update AGENTS.md to reflect the new tooling

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch venables/bump-deps

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