feat: implement media listing with sorting and filtering options

libertas_api/src/schema.rs

@@ -0,0 +1,18 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize)]
+pub struct MediaResponse {
+    pub id: uuid::Uuid,
+    pub storage_path: String,
+    pub original_filename: String,
+    pub mime_type: String,
+    pub hash: String,
+}
+
+#[derive(Deserialize)]
+pub struct ListMediaParams {
+    pub sort_by: Option<String>,
+    pub order: Option<String>,
+    // You can add future filters here, e.g.:
+    // pub mime_type: Option<String>,
+}