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

clients/ping-feature/build.gradle.kts

@@ -43,10 +43,10 @@ kotlin {
   sourceSets {
     commonMain.dependencies {
       // Contract from backend
-      implementation(projects.services.ping.pingApi)
+      implementation(project(":backend:services:ping:ping-api"))
 
-      // UI Kit
-      implementation(project(":clients:shared:common-ui"))
+      // UI Kit (Design System)
+      implementation(project(":frontend:core:design-system"))
 
       // Shared Konfig & Utilities
       implementation(project(":clients:shared"))
@@ -65,6 +65,9 @@ kotlin {
       // Coroutines and serialization
       implementation(libs.bundles.kotlinx.core)
 
+      // DI (Koin) for resolving apiClient from container
+      implementation(libs.koin.core)
+
       // ViewModel lifecycle
       implementation(libs.bundles.compose.common)