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/auth-feature/build.gradle.kts

@@ -42,8 +42,8 @@ kotlin {
 
   sourceSets {
     commonMain.dependencies {
-      // UI Kit
-      implementation(project(":clients:shared:common-ui"))
+      // UI Kit (Design System)
+      implementation(project(":frontend:core:design-system"))
 
       // Shared Konfig & Utilities (AppConfig + BuildConfig)
       implementation(project(":clients:shared"))