refactor: extract inline tests to separate files in auth + storage adapters

crates/adapters/auth/tests/password.rs

@@ -0,0 +1,10 @@
+use adapters_auth::BcryptPasswordHasher;
+use domain::ports::PasswordHasher;
+
+#[tokio::test]
+async fn hash_and_verify_roundtrip() {
+    let h = BcryptPasswordHasher;
+    let hash = h.hash("mysecretpassword").await.unwrap();
+    assert!(h.verify("mysecretpassword", &hash).await.unwrap());
+    assert!(!h.verify("wrongpassword", &hash).await.unwrap());
+}