Feat: Lemnos Map (#2683)

## Description:

Introduces the Greek island, Lemnos, as a map. The island is both fun
and challenging to play (because of the terrain and elevation) and this
addition was inspired by Altis from the game [Arma
3](https://armedassault.fandom.com/wiki/Altis). The nation names are set
based on the real landmarks, towns, and regions.

<img width="2190" height="1791" alt="image"
src="https://github.com/user-attachments/assets/a7a6de54-f376-43ac-87da-f20aecfebbe0"
/>

<img width="1994" height="1608" alt="image"
src="https://github.com/user-attachments/assets/bc280780-298f-4342-8313-db6cc27ac188"
/>



## 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:

bijx

resources/maps/lemnos/manifest.json

@@ -0,0 +1,65 @@
+{
+  "map": {
+    "height": 1420,
+    "num_land_tiles": 874650,
+    "width": 1750
+  },
+  "map16x": {
+    "height": 355,
+    "num_land_tiles": 53106,
+    "width": 437
+  },
+  "map4x": {
+    "height": 710,
+    "num_land_tiles": 216592,
+    "width": 875
+  },
+  "name": "lemnos",
+  "nations": [
+    {
+      "coordinates": [550, 317],
+      "flag": "",
+      "name": "Gomati"
+    },
+    {
+      "coordinates": [1371, 254],
+      "flag": "",
+      "name": "Zematas"
+    },
+    {
+      "coordinates": [1096, 605],
+      "flag": "",
+      "name": "Kotsinas"
+    },
+    {
+      "coordinates": [518, 894],
+      "flag": "",
+      "name": "Evgatis"
+    },
+    {
+      "coordinates": [250, 879],
+      "flag": "",
+      "name": "Kavala"
+    },
+    {
+      "coordinates": [814, 460],
+      "flag": "",
+      "name": "Atsiki"
+    },
+    {
+      "coordinates": [474, 542],
+      "flag": "",
+      "name": "Sardes"
+    },
+    {
+      "coordinates": [691, 755],
+      "flag": "",
+      "name": "Portianou"
+    },
+    {
+      "coordinates": [1177, 975],
+      "flag": "",
+      "name": "Pyrgos"
+    }
+  ]
+}