Use seedrandom to back PseudoRandom.ts (#1828)

## Description:

The previous implementation had a bug that biased numbers away from 0,
so random.chance(1500+) would always return false. This caused trains to
not spawn at all when their spawn rate was sufficiently low. We should
be using a library instead of implementing it from scratch anyways.

## 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:

evan

package-lock.json

@@ -28,6 +28,7 @@
         "js-yaml": "^4.1.0",
         "nanoid": "^3.3.6",
         "obscenity": "^0.4.3",
+        "seedrandom": "^3.0.5",
         "ts-node": "^10.9.2",
         "uuid": "^11.1.0",
         "winston": "^3.17.0",
@@ -53,6 +54,7 @@
         "@types/msgpack5": "^3.4.6",
         "@types/node": "^22.10.2",
         "@types/pg": "^8.11.11",
+        "@types/seedrandom": "^3.0.8",
         "@types/sinon": "^17.0.3",
         "@types/systeminformation": "^3.23.1",
         "@types/ws": "^8.5.11",
@@ -6926,6 +6928,13 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@types/seedrandom": {
+      "version": "3.0.8",
+      "resolved": "https://registry.npmjs.org/@types/seedrandom/-/seedrandom-3.0.8.tgz",
+      "integrity": "sha512-TY1eezMU2zH2ozQoAFAQFOPpvP15g+ZgSfTZt31AUUH/Rxtnz3H+A/Sv1Snw2/amp//omibc+AEkTaA8KUeOLQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@types/send": {
       "version": "0.17.5",
       "resolved": "https://registry.npmjs.org/@types/send/-/send-0.17.5.tgz",
@@ -17608,6 +17617,12 @@
         "url": "https://opencollective.com/webpack"
       }
     },
+    "node_modules/seedrandom": {
+      "version": "3.0.5",
+      "resolved": "https://registry.npmjs.org/seedrandom/-/seedrandom-3.0.5.tgz",
+      "integrity": "sha512-8OwmbklUNzwezjGInmZ+2clQmExQPvomqjL7LFqOYqtmuxRgQYqOD3mHaU+MvZn5FLUeVxVfQjwLZW/n/JFuqg==",
+      "license": "MIT"
+    },
     "node_modules/select-hose": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/select-hose/-/select-hose-2.0.0.tgz",