Add Korea Map (#3977)

## Description:

Add map of korean peninsula. Size 1092x2149
Nations: 35
based on provinces

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

DISCORD_USERNAME
crunchybbbbb @crunchybbbbb_59469


<img width="1092" height="2149" alt="Korea-2"
src="https://github.com/user-attachments/assets/874100e8-4a68-4f57-b2f7-49aa87b8194d"
/>

two teams nations war video https://www.youtube.com/watch?v=n4h7GAfAHTM

---------

Co-authored-by: Ricky G.P. <realtacoco@gmail.com>

src/core/game/Game.ts

@@ -175,6 +175,7 @@ export enum GameMapType {
   DanishStraits = "Danish Straits",
   NorthwestPassage = "Northwest Passage",
   Venice = "Venice",
+  Korea = "Korea",
   Balkans = "Balkans",
 }
 
@@ -237,6 +238,7 @@ export const mapCategories: Record<string, GameMapType[]> = {
     GameMapType.BeringSea,
     GameMapType.ArchipelagoSea,
     GameMapType.BajaCalifornia,
+    GameMapType.Korea,
     GameMapType.MiddleEast,
     GameMapType.TaiwanStrait,
     GameMapType.Balkans,

src/server/MapPlaylist.ts

@@ -71,6 +71,7 @@ const FREQUENCY: Partial<Record<GameMapName, number>> = {
   IndianSubcontinent: 8,
   Italia: 6,
   Japan: 6,
+  Korea: 5,
   Lemnos: 3,
   Lisbon: 4,
   LosAngeles: 8,