fixing gradle build

infrastructure/auth/auth-client/build.gradle.kts

@@ -18,13 +18,10 @@ dependencies {
     implementation(projects.core.coreDomain)
     implementation(projects.core.coreUtils)
 
-    // Spring Security
-    implementation("org.springframework.boot:spring-boot-starter-oauth2-client")
-    implementation("org.springframework.boot:spring-boot-starter-security")
-    implementation("org.springframework.security:spring-security-oauth2-jose")
-
-    // JWT
-    implementation("com.auth0:java-jwt:4.4.0")
+    implementation(libs.spring.boot.starter.oauth2.client)
+    implementation(libs.spring.boot.starter.security)
+    implementation(libs.spring.security.oauth2.jose)
+    implementation(libs.auth0.java.jwt)
 
     testImplementation(projects.platform.platformTesting)
 }

infrastructure/gateway/build.gradle.kts

@@ -3,6 +3,7 @@ plugins {
     alias(libs.plugins.kotlin.serialization)
     alias(libs.plugins.ktor)
     application
+    alias(libs.plugins.spring.dependencyManagement)
 }
 
 application {
@@ -10,6 +11,7 @@ application {
 }
 
 dependencies {
+    api(platform(libs.spring.boot.dependencies))
     // --- Interne Module ---
     // Der Gateway benötigt nur die Kern-Definitionen und Utilities.
     implementation(projects.platform.platformDependencies)