refactor: Migrate from monolithic to modular architecture

1. **Dokumentation der Architektur:**
    - Vervollständigen Sie die C4-Diagramme im docs-Verzeichnis
    - Dokumentieren Sie die wichtigsten Architekturentscheidungen in ADRs

2. **Redis-Integration finalisieren:**
    - Implementieren Sie die verteilte Cache-Lösung für die Offline-Fähigkeit
    - Nutzen Sie Redis Streams für das Event-Sourcing

.github/workflows/integration-tests.yml

@@ -103,10 +103,38 @@ jobs:
       with:
         java-version: 21
         distribution: 'temurin'
-        cache: gradle
+        cache: 'gradle'
+
+    - name: Setup Gradle
+      uses: gradle/gradle-build-action@v2
+      with:
+        gradle-version: wrapper
+        cache-read-only: ${{ github.ref != 'refs/heads/main' && github.ref != 'refs/heads/develop' }}
+        cache-overwrite-existing: true
+        gradle-home-cache-includes: |
+          caches
+          notifications
+          jdks
+          wrapper
 
     - name: Grant execute permission for gradlew
       run: chmod +x gradlew
 
     - name: Run integration tests
-      run: ./gradlew integrationTest
+      run: ./gradlew integrationTest --no-daemon --parallel
+      env:
+        # Environment variables for Redis connection
+        REDIS_HOST: localhost
+        REDIS_PORT: 6379
+        # Spring profile for integration tests
+        SPRING_PROFILES_ACTIVE: integration-test
+
+    - name: Upload test reports
+      uses: actions/upload-artifact@v3
+      if: always()
+      with:
+        name: integration-test-reports
+        path: |
+          **/build/reports/tests/integrationTest/
+          **/build/test-results/integrationTest/
+        retention-days: 7