feat(domain): value objects, entities, port traits with tests

crates/domain/src/ports/auth.rs

@@ -0,0 +1,14 @@
+use async_trait::async_trait;
+use crate::{errors::DomainError, value_objects::{PasswordHash, Role, UserId}};
+
+#[async_trait]
+pub trait PasswordHasher: Send + Sync {
+    async fn hash(&self, password: &str) -> Result<PasswordHash, DomainError>;
+    async fn verify(&self, password: &str, hash: &PasswordHash) -> Result<bool, DomainError>;
+}
+
+#[async_trait]
+pub trait TokenIssuer: Send + Sync {
+    async fn issue(&self, user_id: &UserId, role: &Role) -> Result<String, DomainError>;
+    async fn verify(&self, token: &str) -> Result<(UserId, Role), DomainError>;
+}