chore(deps): move "split.js" to devDependencies

since it is not used in server side code and it is bundled by webpack, it is only needed during build stage -> devDependency

package.json

@@ -145,7 +145,6 @@
     "serve-favicon": "2.5.0",
     "session-file-store": "1.5.0",
     "source-map-support": "0.5.21",
-    "split.js": "1.6.5",
     "stream-throttle": "0.1.3",
     "strip-bom": "5.0.0",
     "striptags": "3.2.0",
@@ -228,6 +227,7 @@
     "rimraf": "6.0.1",
     "sass": "1.85.1",
     "sass-loader": "16.0.5",
+    "split.js": "1.6.5",
     "supertest": "7.0.0",
     "swagger-jsdoc": "6.2.8",
     "tslib": "2.8.1",