chore(MP-23): network DI client, frontend architecture guards, detekt & ktlint setup, docs, ping DI factory (#21)

* chore(MP-21): snapshot pre-refactor state (Epic 1)

* chore(MP-22): scaffold new repo structure, relocate Docker Compose, move frontend/backend modules, update Makefile; add docs mapping and env template

* MP-22 Epic 2: Erfolgreich umgesetzt und verifiziert

* MP-23 Epic 3: Gradle/Build Governance zentralisieren

frontend/core/navigation/build.gradle.kts

@@ -0,0 +1,40 @@
+/**
+ * Dieses Modul definiert nur die Navigationsrouten.
+ * Es ist noch simpler.
+ */
+plugins {
+  alias(libs.plugins.kotlinMultiplatform)
+}
+
+group = "at.mocode.clients.shared"
+version = "1.0.0"
+
+kotlin {
+  val enableWasm = providers.gradleProperty("enableWasm").orNull == "true"
+
+  jvmToolchain(21)
+
+  jvm()
+
+  js {
+    browser()
+    binaries.executable()
+  }
+
+  if (enableWasm) {
+    @OptIn(org.jetbrains.kotlin.gradle.ExperimentalWasmDsl::class)
+    wasmJs {
+      browser()
+      binaries.executable()
+    }
+  }
+
+  sourceSets {
+    commonMain.dependencies {
+      // No specific dependencies needed for navigation routes
+    }
+    commonTest.dependencies {
+      implementation(libs.kotlin.test)
+    }
+  }
+}

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

@@ -0,0 +1,9 @@
+package at.mocode.clients.shared.navigation
+
+sealed class AppScreen {
+  data object Home : AppScreen()
+  data object Login : AppScreen()
+  data object Ping : AppScreen()
+  data object Profile : AppScreen()
+  data object AuthCallback : AppScreen()
+}