chore(frontend): refactor navigation and DI setup, remove unused shared module

- Replaced `initKoin` with `startKoin` for DI initialization consistency across platforms.
- Introduced `StateNavigationPort` with `StateFlow` to streamline navigation state management.
- Migrated `AppScreen` to sealed class with route mapping for better navigation handling.
- Deleted unused `frontend/shared` module and removed related dependencies from build files.
- Cleaned up legacy navigation and Redux-related code, aligning with MVVM architecture.

frontend/core/auth/build.gradle.kts

@@ -26,12 +26,12 @@ kotlin {
       // UI Kit (Design System)
       implementation(projects.frontend.core.designSystem)
 
-      // Shared Konfig & Utilities
-      implementation(projects.frontend.shared)
-
       // Network core (provides apiClient + TokenProvider interface)
       implementation(projects.frontend.core.network)
 
+      // Domain core (provides AppConstants)
+      implementation(projects.frontend.core.domain)
+
       // Compose dependencies
       implementation(compose.runtime)
       implementation(compose.foundation)

frontend/core/auth/src/commonMain/kotlin/at/mocode/frontend/core/auth/data/AuthApiClient.kt

@@ -1,11 +1,12 @@
 package at.mocode.frontend.core.auth.data
 
-import at.mocode.shared.core.AppConstants
+import at.mocode.frontend.core.domain.AppConstants
 import io.ktor.client.*
 import io.ktor.client.call.*
 import io.ktor.client.request.forms.*
 import io.ktor.client.statement.*
 import io.ktor.http.*
+import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 
 @Serializable
@@ -68,7 +69,7 @@ class AuthApiClient(
         val kc = response.body<KeycloakTokenResponse>()
         LoginResponse(
           success = true,
-          token = kc.access_token,
+          token = kc.accessToken,
           message = null,
           userId = null,
           username = username
@@ -112,7 +113,7 @@ class AuthApiClient(
         val kc = response.body<KeycloakTokenResponse>()
         LoginResponse(
           success = true,
-          token = kc.access_token,
+          token = kc.accessToken,
           message = null
         )
       } else {
@@ -132,13 +133,13 @@ class AuthApiClient(
 
   @Serializable
   private data class KeycloakTokenResponse(
-    val access_token: String,
-    val expires_in: Long? = null,
-    val refresh_expires_in: Long? = null,
-    val refresh_token: String? = null,
-    val token_type: String? = null,
-    val not_before_policy: Long? = null,
-    val session_state: String? = null,
-    val scope: String? = null
+    @SerialName("access_token") val accessToken: String,
+    @SerialName("expires_in") val expiresIn: Long? = null,
+    @SerialName("refresh_expires_in") val refreshExpiresIn: Long? = null,
+    @SerialName("refresh_token") val refreshToken: String? = null,
+    @SerialName("token_type") val tokenType: String? = null,
+    @SerialName("not_before_policy") val notBeforePolicy: Long? = null,
+    @SerialName("session_state") val sessionState: String? = null,
+    @SerialName("scope") val scope: String? = null
   )
 }

frontend/core/auth/src/commonMain/kotlin/at/mocode/frontend/core/auth/di/AuthModule.kt

@@ -4,7 +4,7 @@ import at.mocode.frontend.core.auth.data.AuthApiClient
 import at.mocode.frontend.core.auth.data.AuthTokenManager
 import at.mocode.frontend.core.auth.presentation.LoginViewModel
 import at.mocode.frontend.core.network.TokenProvider
-import at.mocode.shared.core.AppConstants
+import at.mocode.frontend.core.domain.AppConstants
 import org.koin.core.qualifier.named
 import org.koin.dsl.module
 

frontend/core/design-system/build.gradle.kts

@@ -24,8 +24,6 @@ kotlin {
 
   sourceSets {
     commonMain.dependencies {
-      // Shared module dependency
-      implementation(projects.frontend.shared)
 
       // Compose dependencies
       implementation(compose.runtime)

frontend/core/domain/src/commonMain/kotlin/at/mocode/frontend/core/domain/AppConstants.kt

@@ -0,0 +1,11 @@
+package at.mocode.frontend.core.domain
+
+object AppConstants {
+  // Keycloak Configuration
+  // Note: These defaults are for local development.
+  // In production, these should be provided via build config or environment variables.
+  const val KEYCLOAK_URL = "http://localhost:8180"
+  const val KEYCLOAK_REALM = "meldestelle"
+  const val KEYCLOAK_CLIENT_ID = "web-app"
+  const val KEYCLOAK_CLIENT_SECRET = "" // Public client usually has no secret
+}

frontend/core/navigation/src/commonMain/kotlin/at/mocode/clients/shared/navigation/AppScreen.kt

@@ -1,10 +0,0 @@
-package at.mocode.clients.shared.navigation
-
-sealed class AppScreen {
-  data object Landing : AppScreen()
-  data object Home : AppScreen()
-  data object Login : AppScreen()
-  data object Ping : AppScreen()
-  data object Profile : AppScreen()
-  data object AuthCallback : AppScreen()
-}

frontend/core/navigation/src/commonMain/kotlin/at/mocode/frontend/core/navigation/AppScreen.kt

@@ -0,0 +1,24 @@
+package at.mocode.frontend.core.navigation
+
+sealed class AppScreen(val route: String) {
+  data object Landing : AppScreen(Routes.HOME)
+  data object Home : AppScreen("/home")
+  data object Login : AppScreen(Routes.LOGIN)
+  data object Ping : AppScreen("/ping")
+  data object Profile : AppScreen("/profile")
+  data object AuthCallback : AppScreen("/auth/callback")
+
+  companion object {
+    fun fromRoute(route: String): AppScreen {
+      return when (route) {
+        Routes.HOME -> Landing
+        "/home" -> Home
+        Routes.LOGIN, Routes.Auth.LOGIN -> Login
+        "/ping" -> Ping
+        "/profile" -> Profile
+        "/auth/callback" -> AuthCallback
+        else -> Landing // Default fallback
+      }
+    }
+  }
+}

frontend/core/navigation/src/commonMain/kotlin/at/mocode/frontend/core/navigation/DeepLinkHandler.kt

@@ -28,7 +28,7 @@ class DeepLinkHandler(
   private fun processDeepLink(deepLink: DeepLink): Boolean {
     val route = cleanRoute(deepLink.route)
 
-    // If route requires auth and user is missing → redirect to login
+    // If the route requires auth and the user is missing → redirect to log in
     if (requiresAuth(route)) {
       val user = currentUserProvider.getCurrentUser()
       if (user == null) {