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/workflow/block-icon.tsx

@@ -16,11 +16,11 @@ import {
 } from '@/app/components/base/icons/workflow'
 import AppIcon from '@/app/components/base/app-icon'
 
-type BlockIconProps = {
+interface BlockIconProps {
   type: BlockEnum
   size?: string
   className?: string
-  toolIcon?: string | { content: string; background: string }
+  toolIcon?: string | { content: string, background: string }
 }
 const ICON_CONTAINER_CLASSNAME_SIZE_MAP: Record<string, string> = {
   xs: 'w-4 h-4 rounded-[5px] shadow-xs',