feat: sync ephemeral bot demo commands

Sync telesrv 172a86e (feat(bot-demo): echo ephemeral group commands).

Skipped telesrv docs changes per public sync rules.

cmd/bots/aiogramecho/test_echo.py

@@ -0,0 +1,63 @@
+import unittest
+from types import SimpleNamespace
+
+import echo
+
+
+class FakeBot:
+    def __init__(self):
+        self.calls = []
+
+    async def send_message(self, **kwargs):
+        self.calls.append(kwargs)
+        return SimpleNamespace(message_id=0, ephemeral_message_id=88)
+
+
+class FakeMessage:
+    def __init__(self, *, text="hello", ephemeral_id=None):
+        self.text = text
+        self.caption = None
+        self.chat = SimpleNamespace(id=-1000000000002)
+        self.from_user = SimpleNamespace(id=1780243200)
+        self.ephemeral_message_id = ephemeral_id
+        self.model_extra = {}
+        self.bot = FakeBot()
+        self.answers = []
+
+    async def answer(self, text):
+        self.answers.append(text)
+        return SimpleNamespace(message_id=1, ephemeral_message_id=None)
+
+
+class EchoTest(unittest.IsolatedAsyncioTestCase):
+    async def test_ephemeral_echo_uses_receiver_and_transient_reply(self):
+        message = FakeMessage(text="/private@TetrisBot", ephemeral_id=77)
+
+        await echo.send_echo(message, "aiogram echo: ", "ephemeral echo: ")
+
+        self.assertEqual(message.answers, [])
+        self.assertEqual(len(message.bot.calls), 1)
+        call = message.bot.calls[0]
+        self.assertEqual(call["chat_id"], -1000000000002)
+        self.assertEqual(call["text"], "ephemeral echo: /private@TetrisBot")
+        self.assertEqual(call["receiver_user_id"], 1780243200)
+        self.assertEqual(call["reply_parameters"].ephemeral_message_id, 77)
+
+    async def test_normal_echo_stays_on_standard_answer_path(self):
+        message = FakeMessage()
+
+        await echo.send_echo(message, "aiogram echo: ", "ephemeral echo: ")
+
+        self.assertEqual(message.answers, ["aiogram echo: hello"])
+        self.assertEqual(message.bot.calls, [])
+
+    def test_extra_field_fallback_and_invalid_values(self):
+        message = FakeMessage()
+        message.model_extra = {"ephemeral_message_id": 66}
+        self.assertEqual(echo.ephemeral_message_id(message), 66)
+        message.model_extra = {"ephemeral_message_id": True}
+        self.assertIsNone(echo.ephemeral_message_id(message))
+
+
+if __name__ == "__main__":
+    unittest.main()