Add "Chile" to suggested radio settings (region presets)

[n3v1l]

Request

Please add Chile to the suggested radio settings / region presets served at
https://api.meshcore.nz/api/v1/config (config.suggested_radio_settings.entries),
which power the region dropdown in config.meshcore.io, the web flasher and map.meshcore.io.

Latin America currently only has Brazil; there is no Chile entry, even though there's
an active MeshCore network here (MeshChile) that has standardized on a single radio config.

Proposed entry (matches the existing schema)

{
  "title": "Chile",
  "description": "MeshChile · 915–928 MHz ISM band",
  "frequency": 927.875,
  "spreading_factor": 8,
  "bandwidth": 62.5,
  "coding_rate": 5
}

Equivalent to set radio 927.875,62.5,8,5.

Why these values

This is the de-facto standard already in use across the Chilean mesh (confirmed on live
repeaters/room servers reporting radio: "927.875,62.5,8,5"). It's a narrow config
(BW 62.5 / SF 8), consistent with the other "Narrow" presets, and sits in Chile's
915–928 MHz ISM allocation.

Context

• Community: MeshChile — https://meshchile.cl
• National broker: mqtt-msc.meshchile.cl · live map: mapa-msc.meshchile.cl

Note: since the preset list appears to be served from api.meshcore.nz rather than from
a file in this repo, this may need a config/API update rather than a code change — happy
to open the PR wherever the data actually lives if you can point me to it. Thanks!