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_core/src/plugins.rs

@@ -0,0 +1,26 @@
+use std::sync::Arc;
+
+use async_trait::async_trait;
+
+use crate::{
+    error::CoreResult,
+    models::Media,
+    repositories::{AlbumRepository, MediaRepository, UserRepository},
+};
+
+pub struct PluginData {
+    pub message: String,
+}
+
+pub struct PluginContext {
+    pub media_repo: Arc<dyn MediaRepository>,
+    pub album_repo: Arc<dyn AlbumRepository>,
+    pub user_repo: Arc<dyn UserRepository>,
+}
+
+#[async_trait]
+pub trait MediaProcessorPlugin: Send + Sync {
+    fn name(&self) -> &'static str;
+
+    async fn process(&self, media: &Media, context: &PluginContext) -> CoreResult<PluginData>;
+}