feat: show user id in subscription message

tests/test_payments.py

@@ -214,7 +214,8 @@ class SubscribeCommandTests(unittest.IsolatedAsyncioTestCase):
         ):
             await bot.subscribe_command(message, _StubState())
         invoice.assert_awaited_once_with(message.bot, 555, None)
-        self.assertIn("Счёт", message.answers[0])
+        self.assertIn("Счёт на подписку", message.answers[0])
+        self.assertIn("ID пользователя: <code>42</code>", message.answers[0])
         self.assertEqual(len(message.answers), 2)
         self.assertNotIn("dev", " ".join(message.answers).lower())
         self.assertNotIn("reply_markup", message.answer_kwargs[-1])
@@ -232,6 +233,7 @@ class SubscribeCommandTests(unittest.IsolatedAsyncioTestCase):
         self.assertIn("Счёт", message.answers[0])
         markup = message.answer_kwargs[-1]["reply_markup"]
         self.assertEqual(markup.inline_keyboard[0][0].text, "🧪 Оплатил (dev)")
+        self.assertIn("ID пользователя: <code>42</code>", message.answers[0])
 
     async def test_dev_confirmation_activates_only_for_invoice_user(self):
         callback = AsyncMock()