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/ui/field/input/hooks/__tests__/useAddressAutocomplete.test.tsx

@@ -2,8 +2,8 @@ import { useGetPlaceApiData } from '@/geo-map/hooks/useGetPlaceApiData';
 import { useCloseDropdown } from '@/ui/layout/dropdown/hooks/useCloseDropdown';
 import { useOpenDropdown } from '@/ui/layout/dropdown/hooks/useOpenDropdown';
 import { act, renderHook } from '@testing-library/react';
-import { useAddressAutocomplete } from '../useAddressAutocomplete';
-import { useCountryUtils } from '../useCountryUtils';
+import { useAddressAutocomplete } from '@/ui/field/input/hooks/useAddressAutocomplete';
+import { useCountryUtils } from '@/ui/field/input/hooks/useCountryUtils';
 
 // Mock dependencies
 jest.mock('@/geo-map/hooks/useGetPlaceApiData');