refactor: update hash_password and verify_password to use algorithm interface

tests/test_hashing.py

@@ -18,3 +18,9 @@ def test_hash_password_returns_base64() -> None:
 
 def test_verify_password_handles_invalid_base64() -> None:
     assert verify_password("secret", "**invalid**", "???") is False
+
+
+def test_hash_password_with_algorithm_parameter():
+    """Verify hash_password accepts algorithm parameter."""
+    salt, hashed = hash_password("test", algorithm="pbkdf2")
+    assert verify_password("test", salt, hashed, algorithm="pbkdf2")