issue: Radiant Collection (`rc`) has zero cards despite `cardCount.official: 25`

[FrostyFitz]

What seems to be the issue

Set

Field(s)

Reports count for set, but no data present

Description

---

2. New issue — Radiant Collection (rc) has zero cards despite cardCount.official: 25

**Title:** issue: Radiant Collection (rc) set metadata claims 25 cards, API returns none

### Where are you having the issue
- [x] JSON API
- [ ] GraphQL

### Is the issue affecting one of the two elements below?
- [ ] Translations
- [x] Definitions Files (Open API, GraphQL Schema, etc)

### Description

The `rc` (Radiant Collection, Black & White era) set entry reports 25 official cards in its `cardCount`, but its `cards` array is empty — the set exists as metadata with no underlying card data at all, in EN.

#### Reproduction

```console
$ curl -s https://api.tcgdex.net/v2/en/sets/rc | jq '{id, name, cardCount, cards: (.cards | length)}'
{
  "id": "rc",
  "name": "Radiant Collection",
  "cardCount": { "total": 25, "official": 25, "normal": 0, "holo": 0, "reverse": 0, "firstEd": 0 },
  "cards": 0
}