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>

utils/format.ts

@@ -4,8 +4,7 @@
  * @example formatNumber(1234567.89) will return '1,234,567.89'
  */
 export const formatNumber = (num: number | string) => {
-  if (!num)
-    return num
+  if (!num) { return num }
   const parts = num.toString().split('.')
   parts[0] = parts[0].replace(/\B(?=(\d{3})+(?!\d))/g, ',')
   return parts.join('.')
@@ -18,8 +17,7 @@ export const formatNumber = (num: number | string) => {
  * @example formatFileSize(1024 * 1024) will return '1.00MB'
  */
 export const formatFileSize = (fileSize: number) => {
-  if (!fileSize)
-    return fileSize
+  if (!fileSize) { return fileSize }
   const units = ['', 'K', 'M', 'G', 'T', 'P']
   let index = 0
   while (fileSize >= 1024 && index < units.length) {
@@ -35,8 +33,7 @@ export const formatFileSize = (fileSize: number) => {
  * @example formatTime(60 * 60) will return '1.00 h'
  */
 export const formatTime = (seconds: number) => {
-  if (!seconds)
-    return seconds
+  if (!seconds) { return seconds }
   const units = ['sec', 'min', 'h']
   let index = 0
   while (seconds >= 60 && index < units.length) {
@@ -46,7 +43,7 @@ export const formatTime = (seconds: number) => {
   return `${seconds.toFixed(2)} ${units[index]}`
 }
 
-export const downloadFile = ({ data, fileName }: { data: Blob; fileName: string }) => {
+export const downloadFile = ({ data, fileName }: { data: Blob, fileName: string }) => {
   const url = window.URL.createObjectURL(data)
   const a = document.createElement('a')
   a.href = url

utils/prompt.ts

@@ -3,8 +3,7 @@ import type { PromptVariable, UserInputFormItem } from '@/types/app'
 export function replaceVarWithValues(str: string, promptVariables: PromptVariable[], inputs: Record<string, any>) {
   return str.replace(/\{\{([^}]+)\}\}/g, (match, key) => {
     const name = inputs[key]
-    if (name)
-      return name
+    if (name) { return name }
 
     const valueObj: PromptVariable | undefined = promptVariables.find(v => v.key === key)
     return valueObj ? `{{${valueObj.key}}}` : match
@@ -12,8 +11,7 @@ export function replaceVarWithValues(str: string, promptVariables: PromptVariabl
 }
 
 export const userInputsFormToPromptVariables = (useInputs: UserInputFormItem[] | null) => {
-  if (!useInputs)
-    return []
+  if (!useInputs) { return [] }
   const promptVariables: PromptVariable[] = []
   useInputs.forEach((item: any) => {
     const [type, content] = (() => {

utils/string.ts

@@ -1,6 +1,6 @@
 const chars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_'
 export function randomString(length: number) {
   let result = ''
-  for (let i = length; i > 0; --i) result += chars[Math.floor(Math.random() * chars.length)]
+  for (let i = length; i > 0; --i) { result += chars[Math.floor(Math.random() * chars.length)] }
   return result
 }

utils/tools.ts

@@ -2,18 +2,15 @@ import type { ThoughtItem } from '@/app/components/chat/type'
 import type { VisionFile } from '@/types/app'
 
 export const sortAgentSorts = (list: ThoughtItem[]) => {
-  if (!list)
-    return list
-  if (list.some(item => item.position === undefined))
-    return list
+  if (!list) { return list }
+  if (list.some(item => item.position === undefined)) { return list }
   const temp = [...list]
   temp.sort((a, b) => a.position - b.position)
   return temp
 }
 
 export const addFileInfos = (list: ThoughtItem[], messageFiles: VisionFile[]) => {
-  if (!list || !messageFiles)
-    return list
+  if (!list || !messageFiles) { return list }
   return list.map((item) => {
     if (item.files && item.files?.length > 0) {
       return {