init: scaffold from k-template with postgres + worker

crates/domain/src/ports/mod.rs

@@ -0,0 +1,7 @@
+mod auth;
+mod storage;
+mod user_repo;
+
+pub use auth::{PasswordHasher, TokenIssuer};
+pub use storage::{DataStream, StoragePort, StorageReader, StorageWriter};
+pub use user_repo::UserRepository;