added vector and sync packages for pgvector operations, renamed classes and added sync providers.

backend/src/main/java/com/vaessl/app/sync/HomeboxSyncProvider.java

@@ -0,0 +1,28 @@
+package com.vaessl.app.sync;
+
+import org.springframework.stereotype.Service;
+import com.vaessl.app.shared.ServiceType;
+import com.vaessl.app.vector.EmbeddingService;
+import com.vaessl.app.vector.VectorSyncProvider;
+
+@Service
+public class HomeboxSyncProvider implements VectorSyncProvider {
+
+    private final EmbeddingService embeddingService;
+
+    public HomeboxSyncProvider(EmbeddingService embeddingService) {
+        this.embeddingService = embeddingService;
+    }
+    
+    @Override
+    public ServiceType getServiceType() {
+        return ServiceType.HOMEBOX;
+    }
+
+    @Override
+    public void syncVectorStore() {
+        // TODO Auto-generated method stub
+        throw new UnsupportedOperationException("Unimplemented method 'syncVectorStore'");
+    }
+
+}