Add twenty/folder-structure custom oxlint rule (#18467)
## Summary
- Re-implements `eslint-plugin-project-structure`'s folder structure
enforcement as a custom oxlint rule (`twenty/folder-structure`),
recovering functionality lost during the ESLint → Oxlint migration
- Validates `src/modules/` structure: kebab-case module folder names,
allowed subdirectories (hooks, utils, components, states, types,
graphql, etc.), hook file naming (`use{PascalCase}.(ts|tsx)`), util file
naming (`{camelCase}.(ts|tsx)`), and module nesting depth (max 4 levels)
- Enabled as `"warn"` in twenty-front with 403 pre-existing violations
to address incrementally
## What the rule checks
| Check | Example valid | Example invalid |
|-------|-------------|-----------------|
| Module names kebab-case | `object-record/` | `graphWidgetBarChart/` |
| Allowed subdirs only | `hooks/`, `components/`, `utils/` |
`random-stuff/` |
| Hook file naming | `useMyHook.ts` | `badName.ts` |
| Util file naming | `buildQuery.ts` | `build-query.ts` |
| Max nesting depth 4 | `a/b/c/d/hooks/` | `a/b/c/d/e/hooks/` |
| Utils kebab-case subfolders | `utils/cron-to-human/` |
`utils/camelCase/` |
## Pre-existing violations (403 total)
| Category | Count | Examples |
|----------|-------|---------|
| Non-kebab-case module names | 160 | `graphWidgetBarChart`,
`AIChatThreads` |
| Module depth > 4 | 215 |
`settings/roles/role-permissions/object-level-permissions/field-permissions`
|
| Util file naming | 22 | `.util.ts` suffix, kebab-case, PascalCase
filenames |
| Misc (hooks, tests) | 6 | Non-hook files in hooks/, folders in test
dirs |
