chore(turnier-feature): remove unused ViewModels and UI components

- Removed `AbteilungViewModel`, `BewerbAnlegenViewModel`, `BewerbViewModel`, and `CreateBewerbWizardScreen`.
- Cleaned up related imports and unused domain models.

frontend/features/reiter-feature/build.gradle.kts

@@ -1,3 +1,5 @@
+import org.jetbrains.kotlin.gradle.ExperimentalWasmDsl
+
 /**
  * Feature-Modul: Reiter-Verwaltung (Desktop-only)
  */
@@ -10,12 +12,15 @@ group = "at.mocode.clients"
 version = "1.0.0"
 kotlin {
   jvm()
+  @OptIn(ExperimentalWasmDsl::class)
+  wasmJs {
+    browser()
+  }
   sourceSets {
-    jvmMain.dependencies {
+    commonMain.dependencies {
       implementation(projects.frontend.core.designSystem)
       implementation(projects.frontend.core.domain)
       implementation(projects.frontend.core.navigation)
-      implementation(compose.desktop.currentOs)
       implementation(compose.foundation)
       implementation(compose.runtime)
       implementation(compose.material3)
@@ -26,5 +31,8 @@ kotlin {
       implementation(libs.koin.compose)
       implementation(libs.koin.compose.viewmodel)
     }
+    jvmMain.dependencies {
+      implementation(compose.desktop.currentOs)
+    }
   }
 }