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/object-metadata/utils/mapFieldMetadataToGraphQLQuery.ts

@@ -7,7 +7,7 @@ import { type RecordGqlFields } from '@/object-record/graphql/record-gql-fields/
 import { isNonCompositeField } from '@/object-record/object-filter-dropdown/utils/isNonCompositeField';
 import { type ObjectPermissions } from 'twenty-shared/types';
 import { computeMorphRelationFieldName, isDefined } from 'twenty-shared/utils';
-import { type FieldMetadataItem } from '../types/FieldMetadataItem';
+import { type FieldMetadataItem } from '@/object-metadata/types/FieldMetadataItem';
 
 type MapFieldMetadataToGraphQLQueryArgs = {
   objectMetadataItems: ObjectMetadataItem[];