feat: migrate ESLint to v9 flat config

- Replace .eslintrc.json with eslint.config.mjs
- Simplify configuration using @antfu/eslint-config
- Add necessary ESLint plugin dependencies
- Disable overly strict style rules
- Set package.json type to module for ESM support
- Fix ESLint disable comment format

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/components/base/tooltip/index.tsx

@@ -5,7 +5,7 @@ import React from 'react'
 import { Tooltip as ReactTooltip } from 'react-tooltip' // fixed version to 5.8.3 https://github.com/ReactTooltip/react-tooltip/issues/972
 import 'react-tooltip/dist/react-tooltip.css'
 
-type TooltipProps = {
+interface TooltipProps {
   selector: string
   content?: string
   htmlContent?: React.ReactNode