feat: implement media listing with sorting and filtering options

libertas_api/src/config.rs

@@ -15,5 +15,10 @@ pub fn load_config() -> CoreResult<Config> {
         broker_url: "nats://localhost:4222".to_string(),
         max_upload_size_mb: Some(100),
         default_storage_quota_gb: Some(10),
+        allowed_sort_columns: Some(vec![
+            "date_taken".to_string(),
+            "created_at".to_string(),
+            "original_filename".to_string(),
+        ]),
     })
 }