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>

service/index.ts

@@ -53,7 +53,7 @@ export const fetchAppParams = async () => {
   return get('parameters')
 }
 
-export const updateFeedback = async ({ url, body }: { url: string; body: Feedbacktype }) => {
+export const updateFeedback = async ({ url, body }: { url: string, body: Feedbacktype }) => {
   return post(url, { body })
 }