Remove domain models and services related to Abteilung, AbteilungsRegelService, and Bewerb: cleanup unnecessary entities, validation logic, and tests across backend modules.

frontend/core/sync/build.gradle.kts

@@ -1,3 +1,7 @@
+@file:OptIn(ExperimentalWasmDsl::class)
+
+import org.jetbrains.kotlin.gradle.ExperimentalWasmDsl
+
 plugins {
   alias(libs.plugins.kotlinMultiplatform)
   alias(libs.plugins.kotlinSerialization)
@@ -5,7 +9,17 @@ plugins {
 
 kotlin {
   jvm()
-  js {
+
+  js(IR) {
+    binaries.library()
+    browser {
+      testTask {
+        enabled = false
+      }
+    }
+  }
+
+  wasmJs {
     binaries.library()
     browser {
       testTask {