refactor: update Dockerfile paths, network module auth flow, and Keycloak config

Updated Dockerfiles to fix frontend path references after refactoring. Refactored `networkModule` to replace the `Auth` plugin with manual auth header injection for enhanced logout support. Adjusted Keycloak realm configuration to set default credentials as non-temporary. Improved error handling in `AuthApiClient` with detailed response messages.

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

@@ -4,6 +4,7 @@ import at.mocode.shared.core.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.Serializable
 
@@ -63,9 +64,10 @@ class AuthApiClient(
           username = username
         )
       } else {
+        val errorBody = response.bodyAsText()
         LoginResponse(
           success = false,
-          message = "Login fehlgeschlagen: HTTP ${response.status.value}"
+          message = "Login fehlgeschlagen: HTTP ${response.status.value} - $errorBody"
         )
       }
     } catch (e: Exception) {
@@ -104,9 +106,10 @@ class AuthApiClient(
           message = null
         )
       } else {
+        val errorBody = response.bodyAsText()
         LoginResponse(
           success = false,
-          message = "Token refresh fehlgeschlagen: HTTP ${response.status.value}"
+          message = "Token refresh fehlgeschlagen: HTTP ${response.status.value} - $errorBody"
         )
       }
     } catch (e: Exception) {

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

@@ -15,10 +15,10 @@ val authModule = module {
   // Single in-memory token manager
   single { AuthTokenManager() }
 
-  // AuthApiClient with injected apiClient and DEV client secret
+  // AuthApiClient with injected baseHttpClient (NOT apiClient)
   single {
     AuthApiClient(
-      httpClient = get(named("apiClient")),
+      httpClient = get(named("baseHttpClient")),
       clientSecret = AppConstants.KEYCLOAK_CLIENT_SECRET
     )
   }
@@ -30,8 +30,7 @@ val authModule = module {
   single<TokenProvider> {
     object : TokenProvider {
       override fun getAccessToken(): String? {
-        val token = get<AuthTokenManager>().getToken()
-        return token
+        return get<AuthTokenManager>().getToken()
       }
     }
   }