Add route to create inbox entries

moneymgr_backend/src/main.rs

@@ -155,6 +155,8 @@ async fn main() -> std::io::Result<()> {
                 "/api/movement/{movement_id}",
                 web::delete().to(movement_controller::delete),
             )
+            // Inbox controller
+            .route("/api/inbox", web::post().to(inbox_controller::create))
             // Statistics controller
             .route("/api/stats/global", web::get().to(stats_controller::global))
             .route(