feat: expand workspace to include libertas_infra and libertas_worker

feat(libertas_api): add dependency on libertas_infra and async-nats

refactor(libertas_api): consolidate config loading and add broker_url

refactor(libertas_api): integrate NATS client into app state and services

feat(libertas_core): introduce config module for database and server settings

fix(libertas_core): enhance error handling with detailed messages

feat(libertas_infra): create infrastructure layer with database repositories

feat(libertas_infra): implement Postgres repositories for media and albums

feat(libertas_worker): add worker service to process media jobs via NATS

libertas_api/src/state.rs

@@ -10,4 +10,5 @@ pub struct AppState {
     pub media_service: Arc<dyn MediaService>,
     pub album_service: Arc<dyn AlbumService>,
     pub token_generator: Arc<dyn TokenGenerator>,
+    pub nats_client: async_nats::Client,
 }