Добавлен CI, добавлена отправка письма о получении оплаты, добавлен order_id в success_url

tests/adapters/email/test_smtp_client.py

@@ -164,3 +164,24 @@ def test_send_email_passes_none_when_credentials_blank() -> None:
     call = send.calls[0]
     assert call["username"] is None
     assert call["password"] is None
+
+
+def test_send_email_without_attachment_builds_plain_text_message() -> None:
+    send = StubSend()
+    sender = _make_sender(send)
+
+    asyncio.run(
+        sender.send_email(
+            to="client@example.com",
+            subject="Оплата принята",
+            body="Ваша оплата принята.",
+        )
+    )
+
+    assert len(send.calls) == 1
+    message: EmailMessage = send.calls[0]["message"]
+    assert message["From"] == "no-reply@test"
+    assert message["To"] == "client@example.com"
+    assert message["Subject"] == "Оплата принята"
+    assert "Ваша оплата принята." in message.get_content()
+    assert list(message.iter_attachments()) == []