chore(frontend): cleanup legacy code and improve localization consistency

- Removed deprecated `NotificationCard` component due to dependency on an outdated presentation layer.
- Translated comments and documentation to German for improved localization across `core.auth`, `ping-feature`, and `network`.
- Standardized comment formatting, improved doc clarity, and ensured consistent API documentation in all modules.

frontend/core/network/src/commonMain/kotlin/at/mocode/frontend/core/network/NetworkConfig.kt

@@ -3,8 +3,8 @@ package at.mocode.frontend.core.network
 import kotlin.native.concurrent.ThreadLocal
 
 /**
- * Network configuration with sensible defaults and environment overrides.
- * Defaults to the local API Gateway on port 8081.
+ * Netzwerkkonfiguration mit sinnvollen Standardeinstellungen und Umgebungseinstellungen zum Überschreiben.
+ * Standardmäßig wird das lokale API-Gateway auf Port 8081 verwendet.
  */
 @ThreadLocal
 object NetworkConfig {

frontend/core/network/src/commonMain/kotlin/at/mocode/frontend/core/network/NetworkModule.kt

@@ -132,7 +132,7 @@ val networkModule = module {
           // [baseClient] REQUEST: .../token
           // Access to fetch at ... blocked by CORS policy
 
-          // This confirms it is a CORS issue on the Keycloak server side, or the browser side.
+          // This confirms it is a CORS issue on the Keycloak server side or the browser side.
           // The JS error `TypeError` is GONE in the latest log!
 
           // So the interceptor logic in NetworkModule might be fine, or at least not the cause of the CORS error.
@@ -140,7 +140,7 @@ val networkModule = module {
 
           // We will use a safe lazy resolution pattern.
         } catch (_: Exception) {
-           // ignore
+          // ignore
         }
         execute(request)
       }
@@ -150,19 +150,19 @@ val networkModule = module {
 
       client.plugin(HttpSend).intercept { request ->
         try {
-            // Attempt to resolve TokenProvider from the capturing scope
-            val tokenProvider = try {
-                koinScope.get<TokenProvider>()
-            } catch (_: Exception) {
-                null
-            }
+          // Attempt to resolve TokenProvider from the capturing scope
+          val tokenProvider = try {
+            koinScope.get<TokenProvider>()
+          } catch (_: Exception) {
+            null
+          }
 
-            val token = tokenProvider?.getAccessToken()
-            if (token != null) {
-                request.header("Authorization", "Bearer $token")
-            }
+          val token = tokenProvider?.getAccessToken()
+          if (token != null) {
+            request.header("Authorization", "Bearer $token")
+          }
         } catch (e: Exception) {
-            println("[apiClient] Error injecting auth header: $e")
+          println("[apiClient] Error injecting auth header: $e")
         }
         execute(request)
       }

frontend/core/network/src/jsMain/kotlin/at/mocode/frontend/core/network/PlatformConfig.js.kt

@@ -26,9 +26,9 @@ actual object PlatformConfig {
     }
 
     if (!origin.isNullOrBlank()) {
-        val resolvedUrl = origin.removeSuffix("/") + "/api"
-        console.log("[PlatformConfig] Resolved API_BASE_URL from window.location.origin: $resolvedUrl")
-        return resolvedUrl
+      val resolvedUrl = origin.removeSuffix("/") + "/api"
+      console.log("[PlatformConfig] Resolved API_BASE_URL from window.location.origin: $resolvedUrl")
+      return resolvedUrl
     }
 
     // 3) Fallback to the local gateway directly (e.g. for tests without window)