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

resources/maps/surrounded/manifest.json

@@ -0,0 +1,60 @@
+{
+  "map": {
+    "height": 1976,
+    "num_land_tiles": 767607,
+    "width": 1976
+  },
+  "map16x": {
+    "height": 494,
+    "num_land_tiles": 45797,
+    "width": 494
+  },
+  "map4x": {
+    "height": 988,
+    "num_land_tiles": 188989,
+    "width": 988
+  },
+  "name": "Surrounded",
+  "nations": [
+    {
+      "coordinates": [1043, 910],
+      "flag": "",
+      "name": "Endangered Islander"
+    },
+    {
+      "coordinates": [684, 271],
+      "flag": "",
+      "name": "North Islander"
+    },
+    {
+      "coordinates": [1429, 429],
+      "flag": "",
+      "name": "Isolated Islander"
+    },
+    {
+      "coordinates": [1726, 1022],
+      "flag": "",
+      "name": "Volcano Islander"
+    },
+    {
+      "coordinates": [1422, 1569],
+      "flag": "",
+      "name": "Resilient Islander"
+    },
+    {
+      "coordinates": [670, 1742],
+      "flag": "",
+      "name": "Vulnerable Islander"
+    },
+    {
+      "coordinates": [282, 1160],
+      "flag": "",
+      "name": "Unyielding Islander"
+    },
+    {
+      "coordinates": [384, 469],
+      "flag": "",
+      "name": "Rugged Islander"
+    }
+  ]
+}