Big Map PR: Adds map of Russia (#4521)

## Description:

**Adds map of Russia, large map for the largest country:** 

Yet another country map that uses impassable terrain, to go along the
China and USA maps.

Huge map with 2.5M land pixels (so that it can reach the biggest lobby
ammount, 125 players). By total area this is also one of the largest
maps, this will create fun crazy matches with massive endgames.

80+ nations/NPCs representing russian Oblasts, Republics and more, each
with their own flag (2/3 of the files of the PR are the flags 😂)

<img width="1307" height="541" alt="image"
src="https://github.com/user-attachments/assets/38c71d1c-03ed-4a75-97a3-d061f46e1b04"
/>

## 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

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

tri.star1011

src/core/game/Maps.gen.ts

@@ -77,6 +77,7 @@ export enum GameMapType {
   Pangaea = "Pangaea", // map-generator/assets/maps/pangaea/info.json
   Passage = "Passage", // map-generator/assets/maps/passage/info.json
   Pluto = "Pluto", // map-generator/assets/maps/pluto/info.json
+  Russia = "Russia", // map-generator/assets/maps/russia/info.json
   SanFrancisco = "San Francisco", // map-generator/assets/maps/sanfrancisco/info.json
   Sierpinski = "Sierpinski", // map-generator/assets/maps/sierpinski/info.json
   SouthAmerica = "South America", // map-generator/assets/maps/southamerica/info.json
@@ -699,6 +700,13 @@ export const maps: readonly MapInfo[] = [
     multiplayerFrequency: 6,
     specialTeamCount: 2,
   },
+  {
+    id: "Russia",
+    type: GameMapType.Russia,
+    translationKey: "map.russia",
+    categories: ["europe", "asia", "new", "countries"],
+    multiplayerFrequency: 8,
+  },
   {
     id: "SanFrancisco",
     type: GameMapType.SanFrancisco,