feat: Implement NATS-based event processing for note smart features and add Qdrant collection auto-creation.

notes-infra/src/factory.rs

@@ -47,6 +47,7 @@ pub async fn build_vector_store(
     match provider {
         VectorProvider::Qdrant { url, collection } => {
             let adapter = crate::vector::qdrant::QdrantVectorAdapter::new(url, collection)?;
+            adapter.create_collection_if_not_exists().await?;
             Ok(Arc::new(adapter))
         }
     }