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

notes-api/src/state.rs

@@ -14,6 +14,7 @@ pub struct AppState {
     pub note_service: Arc<NoteService>,
     pub tag_service: Arc<TagService>,
     pub user_service: Arc<UserService>,
+    pub nats_client: async_nats::Client,
     pub config: Config,
 }
 
@@ -25,6 +26,7 @@ impl AppState {
         note_service: Arc<NoteService>,
         tag_service: Arc<TagService>,
         user_service: Arc<UserService>,
+        nats_client: async_nats::Client,
         config: Config,
     ) -> Self {
         Self {
@@ -34,6 +36,7 @@ impl AppState {
             note_service,
             tag_service,
             user_service,
+            nats_client,
             config,
         }
     }