Adds Milky Way Map (#3519)

## Description:

Adds Milky Way galaxy map based on real reconstruction by NASA. Star
density simulated as terrain. Best played in Dark Mode.

Also adds credits to JPL NASA

<img width="532" height="533" alt="Captura de pantalla 2026-03-26
142938"
src="https://github.com/user-attachments/assets/87bb19bb-4e2d-4383-a3e9-6e14b714b84c"
/>

## 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:

tri.star1011

src/core/game/Game.ts

@@ -143,6 +143,7 @@ export enum GameMapType {
   Arctic = "Arctic",
   SanFrancisco = "San Francisco",
   Aegean = "Aegean",
+  MilkyWay = "MilkyWay",
 }
 
 export type GameMapName = keyof typeof GameMapType;
@@ -207,6 +208,7 @@ export const mapCategories: Record<string, GameMapType[]> = {
     GameMapType.Surrounded,
     GameMapType.TradersDream,
     GameMapType.Passage,
+    GameMapType.MilkyWay,
   ],
   arcade: [
     GameMapType.TheBox,

src/server/MapPlaylist.ts

@@ -84,6 +84,7 @@ const frequency: Partial<Record<GameMapName, number>> = {
   Arctic: 6,
   SanFrancisco: 3,
   Aegean: 6,
+  MilkyWay: 8,
 };
 
 const TEAM_WEIGHTS: { config: TeamCountConfig; weight: number }[] = [