Add Japan map (#2106)

## Description:

This PR adds a new Japan map.

<img width="975" height="967" alt="スクリーンショット 2025-09-28 18 06 11"
src="https://github.com/user-attachments/assets/5ef06c1a-f020-4109-a5df-3cba7a9a074f"
/>

## 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:

aotumuri

map-generator/assets/maps/japan/info.json

@@ -0,0 +1,77 @@
+{
+  "name": "japan",
+  "nations": [
+    {
+      "coordinates": [1895, 288],
+      "name": "Hokkaido",
+      "strength": 2,
+      "flag": "jp"
+    },
+    {
+      "coordinates": [1647, 897],
+      "name": "Tohoku",
+      "strength": 2,
+      "flag": "jp"
+    },
+    {
+      "coordinates": [1613, 1133],
+      "name": "Kanto",
+      "strength": 2,
+      "flag": "jp"
+    },
+    {
+      "coordinates": [1391, 1194],
+      "name": "Chubu",
+      "strength": 2,
+      "flag": "jp"
+    },
+    {
+      "coordinates": [1191, 1370],
+      "name": "Kansai",
+      "strength": 2,
+      "flag": "jp"
+    },
+    {
+      "coordinates": [932, 1308],
+      "name": "Chugoku",
+      "strength": 2,
+      "flag": "jp"
+    },
+    {
+      "coordinates": [949, 1454],
+      "name": "Shikoku",
+      "strength": 2,
+      "flag": "jp"
+    },
+    {
+      "coordinates": [709, 1570],
+      "name": "Kyushu",
+      "strength": 2,
+      "flag": "jp"
+    },
+    {
+      "coordinates": [397, 2283],
+      "name": "Okinawa",
+      "strength": 1,
+      "flag": "jp"
+    },
+    {
+      "coordinates": [1493, 1246],
+      "name": "Mount Fuji",
+      "strength": 1,
+      "flag": "jp"
+    },
+    {
+      "coordinates": [1565, 1178],
+      "name": "Tokyo",
+      "strength": 3,
+      "flag": "jp"
+    },
+    {
+      "coordinates": [1158, 1290],
+      "name": "Kyoto",
+      "strength": 3,
+      "flag": "jp"
+    }
+  ]
+}

map-generator/main.go

@@ -38,6 +38,7 @@ var maps = []struct {
 	{Name: "baikal"},
 	{Name: "halkidiki"},
 	{Name: "italia"},
+	{Name: "japan"},
 	{Name: "straitofgibraltar"},
 	{Name: "pluto"},
 	{Name: "big_plains", IsTest: true},

resources/lang/en.json

@@ -176,6 +176,7 @@
     "halkidiki": "Halkidiki",
     "straitofgibraltar": "Strait of Gibraltar",
     "italia": "Italia",
+    "japan": "Japan",
     "yenisei": "Yenisei",
     "pluto": "Pluto",
     "montreal": "Montreal"

resources/maps/japan/manifest.json

@@ -0,0 +1,94 @@
+{
+  "height": 2500,
+  "map": {
+    "height": 2500,
+    "num_land_tiles": 488183,
+    "width": 2500
+  },
+  "map16x": {
+    "height": 625,
+    "num_land_tiles": 28632,
+    "width": 625
+  },
+  "map4x": {
+    "height": 1250,
+    "num_land_tiles": 119450,
+    "width": 1250
+  },
+  "name": "japan",
+  "nations": [
+    {
+      "coordinates": [1895, 288],
+      "flag": "jp",
+      "name": "Hokkaido",
+      "strength": 2
+    },
+    {
+      "coordinates": [1647, 897],
+      "flag": "jp",
+      "name": "Tohoku",
+      "strength": 2
+    },
+    {
+      "coordinates": [1613, 1133],
+      "flag": "jp",
+      "name": "Kanto",
+      "strength": 2
+    },
+    {
+      "coordinates": [1391, 1194],
+      "flag": "jp",
+      "name": "Chubu",
+      "strength": 2
+    },
+    {
+      "coordinates": [1191, 1370],
+      "flag": "jp",
+      "name": "Kansai",
+      "strength": 2
+    },
+    {
+      "coordinates": [932, 1308],
+      "flag": "jp",
+      "name": "Chugoku",
+      "strength": 2
+    },
+    {
+      "coordinates": [949, 1454],
+      "flag": "jp",
+      "name": "Shikoku",
+      "strength": 2
+    },
+    {
+      "coordinates": [709, 1570],
+      "flag": "jp",
+      "name": "Kyushu",
+      "strength": 2
+    },
+    {
+      "coordinates": [397, 2283],
+      "flag": "jp",
+      "name": "Okinawa",
+      "strength": 1
+    },
+    {
+      "coordinates": [1493, 1246],
+      "flag": "jp",
+      "name": "Mount Fuji",
+      "strength": 1
+    },
+    {
+      "coordinates": [1565, 1178],
+      "flag": "jp",
+      "name": "Tokyo",
+      "strength": 3
+    },
+    {
+      "coordinates": [1158, 1290],
+      "flag": "jp",
+      "name": "Kyoto",
+      "strength": 3
+    }
+  ],
+  "width": 2500
+}

src/client/components/Maps.ts

@@ -32,6 +32,7 @@ export const MapDescription: Record<keyof typeof GameMapType, string> = {
   Halkidiki: "Halkidiki",
   StraitOfGibraltar: "Strait of Gibraltar",
   Italia: "Italia",
+  Japan: "Japan",
   Yenisei: "Yenisei",
   Pluto: "Pluto",
   Montreal: "Montreal",

src/core/configuration/DefaultConfig.ts

@@ -63,6 +63,7 @@ const numPlayersConfig = {
   [GameMapType.Halkidiki]: [100, 50, 40],
   [GameMapType.Iceland]: [50, 40, 30],
   [GameMapType.Italia]: [50, 30, 20],
+  [GameMapType.Japan]: [20, 15, 10],
   [GameMapType.Mars]: [70, 40, 30],
   [GameMapType.Mena]: [70, 50, 40],
   [GameMapType.Montreal]: [60, 40, 30],

src/core/game/Game.ts

@@ -82,6 +82,7 @@ export enum GameMapType {
   Halkidiki = "Halkidiki",
   StraitOfGibraltar = "Strait of Gibraltar",
   Italia = "Italia",
+  Japan = "Japan",
   Yenisei = "Yenisei",
   Pluto = "Pluto",
   Montreal = "Montreal",
@@ -116,6 +117,7 @@ export const mapCategories: Record<string, GameMapType[]> = {
     GameMapType.Halkidiki,
     GameMapType.StraitOfGibraltar,
     GameMapType.Italia,
+    GameMapType.Japan,
     GameMapType.Yenisei,
     GameMapType.Montreal,
   ],

src/server/MapPlaylist.ts

@@ -38,6 +38,7 @@ const frequency: Partial<Record<GameMapName, number>> = {
   Halkidiki: 4,
   Iceland: 4,
   Italia: 6,
+  Japan: 6,
   Mars: 3,
   Mena: 6,
   Montreal: 6,