New Map! "Surrounded" 🏝️ (#2770)

## Description:

A new map where you basically have to hop from island to island :) 
We don't have such a map at the moment.
There is a special center island which isn't necessary to get 80% of the
map.
This map could be very interesting in team games. One hydro will destroy
an entire island.
Size: 1976 x 1976
Nations: 8

<img width="949" height="951" alt="Screenshot 2026-01-02 214219"
src="https://github.com/user-attachments/assets/7139bcc9-6a05-414d-90c1-33cc36dd94fb"
/>

## 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:

FloPinguin

src/client/components/Maps.ts

@@ -46,6 +46,7 @@ export const MapDescription: Record<keyof typeof GameMapType, string> = {
   Lemnos: "Lemnos",
   TwoLakes: "Two Lakes",
   StraitOfHormuz: "Strait of Hormuz",
+  Surrounded: "Surrounded",
 };
 
 @customElement("map-display")

src/core/configuration/DefaultConfig.ts

@@ -87,6 +87,7 @@ const numPlayersConfig = {
   [GameMapType.Lemnos]: [20, 15, 10],
   [GameMapType.TwoLakes]: [60, 50, 40],
   [GameMapType.StraitOfHormuz]: [40, 36, 30],
+  [GameMapType.Surrounded]: [56, 28, 14], // 4, 2, 1 players per island
 } as const satisfies Record<GameMapType, [number, number, number]>;
 
 export abstract class DefaultServerConfig implements ServerConfig {

src/core/game/Game.ts

@@ -109,6 +109,7 @@ export enum GameMapType {
   Lemnos = "Lemnos",
   TwoLakes = "Two Lakes",
   StraitOfHormuz = "Strait of Hormuz",
+  Surrounded = "Surrounded",
 }
 
 export type GameMapName = keyof typeof GameMapType;
@@ -159,6 +160,7 @@ export const mapCategories: Record<string, GameMapType[]> = {
     GameMapType.BaikalNukeWars,
     GameMapType.FourIslands,
     GameMapType.Svalmel,
+    GameMapType.Surrounded,
   ],
 };
 

src/server/MapPlaylist.ts

@@ -59,6 +59,7 @@ const frequency: Partial<Record<GameMapName, number>> = {
   Lemnos: 3,
   TwoLakes: 6,
   StraitOfHormuz: 4,
+  Surrounded: 4,
 };
 
 interface MapWithMode {