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/config.rs

@@ -0,0 +1,37 @@
+use serde::Deserialize;
+
+use crate::error::CoreResult;
+
+#[derive(Deserialize, Clone)]
+pub enum DatabaseType {
+    Postgres,
+    Sqlite,
+}
+
+#[derive(Deserialize, Clone)]
+pub struct DatabaseConfig {
+    pub db_type: DatabaseType,
+    pub url: String,
+}
+
+#[derive(Deserialize, Clone)]
+pub struct Config {
+    pub database: DatabaseConfig,
+    pub server_address: String,
+    pub jwt_secret: String,
+    pub media_library_path: String,
+    pub broker_url: String,
+}
+
+pub fn load_config() -> CoreResult<Config> {
+    Ok(Config {
+        database: DatabaseConfig {
+            db_type: DatabaseType::Postgres,
+            url: "postgres://postgres:postgres@localhost:5432/libertas_db".to_string(),
+        },
+        server_address: "127.0.0.1:8080".to_string(),
+        jwt_secret: "super_secret_jwt_key".to_string(),
+        media_library_path: "media_library".to_string(),
+        broker_url: "amqp://guest:guest@localhost:5672/".to_string(),
+    })
+}