Add source, listed and configured filters to admin app list (#24779)

Closes twentyhq/core-team-issues#2792

## What

Improves the admin panel "All App Registrations" list:

- **Filters** in the existing search filter dropdown, grouped by
section:
- **Source**: NPM / Tarball / OAuth / Local (multi-select, defaults to
NPM)
  - **Listed**: Listed / Not listed
  - **Configured**: Configured / Not configured
- **Total count**: the section description now shows the number of
registrations matching the current filters (`(N matching)`), same
pattern as the admin chats page.
- **Ordering**: removed the client-side re-sort by `isConfigured` so the
list follows the server's `createdAt DESC` order.

## How

- `findAllApplicationRegistrations` (admin resolver) accepts three new
optional args: `sourceTypes`, `isListed`, `isConfigured`.
- `sourceTypes` and `isListed` are plain SQL predicates. `isConfigured`
is computed from variables/installs (`isConfiguredBatch`), so when that
filter is set the service fetches the matching rows, filters on the
computed status, and paginates in memory — keeping `totalCount` and
`hasMore` correct.
- Frontend reuses the existing `SearchInput` filter dropdown pattern
(`MenuItemToggle` + `DropdownMenuSectionLabel`); the pre-installed-only
toggle is untouched.

<img width="1467" height="1067" alt="image"
src="https://github.com/user-attachments/assets/acc9b1c7-6fed-4a7f-9bb8-5487a1ce27fc"
/>