feat(bot): /start without a code on the demo stand opens a private copy of veteran Andrey

Refs #108

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/channels/telegram.py

@@ -194,11 +194,28 @@ class TelegramChannel:
             await self._dispatch(chat_id, person.token, Event(type="start", params={"code": code}))
             return
         token = await self.directory.token_for(chat_id)
+        if token is None and get_settings().demo_clock:
+            token = await self._demo_copy(chat_id)
         if token is None:
             await self._say(chat_id, texts.not_connected)
             return
         await self._dispatch(chat_id, token, Event(type="start"))
 
+    async def _demo_copy(self, chat_id: int) -> str | None:
+        """Demo stand (DEMO_CLOCK): `/start` without a code gets a private copy of veteran Andrey (synthetic),
+        starting from consent and the intake — the same entry as the ЕМИАС demo button of the web app."""
+        from app.api.patient_web import _fresh_demo_copy
+
+        try:
+            token = (await _fresh_demo_copy(start_in_chat=False)).token
+        except Exception:
+            log.exception("start: demo copy failed")
+            return None
+        if not await self.directory.bind(chat_id, token):
+            return None
+        log.info("start: demo copy bound tok=%s", _short(token))
+        return token
+
     async def on_text(self, chat_id: int, text: str | None) -> None:
         texts = load_texts()
         token = await self.directory.token_for(chat_id)