Félix Malfait 7fb8cc1c39 Improve apps settings UI and remove unused tarball upload code (#18549)
## Summary
- Improves the Developer Tab in Settings > Applications: adds
source-type badges (Dev / Npm / Internal), better empty state with `yarn
twenty app:dev` CLI command, renames sections to "Create & Develop" and
"Your Apps"
- Simplifies the Distribution Tab: only shows marketplace section for
npm-sourced apps, removes the manual `isListed` toggle (now managed
automatically by the catalog sync cron)
- Removes dead frontend code: `installApplication` mutation (unused —
installs go through `installMarketplaceApp`), `uploadAppTarball`
mutation/hook, and `SettingsUploadTarballModal`

## Test plan
- [ ] Navigate to Settings > Applications > Developer tab: verify badges
show correctly, empty state shows CLI command
- [ ] Create/view a LOCAL app registration: verify Distribution tab does
NOT show marketplace section
- [ ] Create/view an NPM app registration: verify Distribution tab shows
marketplace section with Featured toggle
- [ ] Verify no references to upload tarball or install application
remain in the UI


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