feat: enforce @/ alias for imports and fix all relative parent imports (#16787)

## Summary
This PR enforces the use of `@/` alias for imports instead of relative
parent imports (`../`).

## Changes

### ESLint Configuration
- Added `no-restricted-imports` pattern in `eslint.config.react.mjs` to
block `../*` imports with the message "Relative parent imports are not
allowed. Use @/ alias instead."
- Removed the non-working `import/no-relative-parent-imports` rule
(doesn't work properly in ESLint flat config)

### VS Code Settings
- Added `javascript.preferences.importModuleSpecifier: non-relative` to
`.vscode/settings.json` (TypeScript setting was already there)

### Code Fixes
- Fixed **941 relative parent imports** across **706 files** in
`packages/twenty-front`
- All `../` imports converted to use `@/` alias

## Why
- Consistent import style across the codebase
- Easier to move files without breaking imports
- Better IDE support for auto-imports
- Clearer understanding of where imports come from

packages/twenty-front/src/modules/captcha/utils/__tests__/getCaptchaUrlByProvider.test.ts

@@ -1,6 +1,6 @@
 import { CaptchaDriverType } from '~/generated/graphql';
 
-import { getCaptchaUrlByProvider } from '../getCaptchaUrlByProvider';
+import { getCaptchaUrlByProvider } from '@/captcha/utils/getCaptchaUrlByProvider';
 
 describe('getCaptchaUrlByProvider', () => {
   it('handles GoogleRecaptcha', async () => {

packages/twenty-front/src/modules/captcha/utils/isCaptchaRequiredForPath.ts

@@ -1,5 +1,5 @@
 import { matchPath } from 'react-router-dom';
-import { CAPTCHA_PROTECTED_PATHS } from '../constants/CaptchaProtectedPaths';
+import { CAPTCHA_PROTECTED_PATHS } from '@/captcha/constants/CaptchaProtectedPaths';
 
 export const isCaptchaRequiredForPath = (pathname: string): boolean =>
   CAPTCHA_PROTECTED_PATHS.some((path) =>