feat: implement adapter/telegram/ with aiogram 3.x

Virtual DM chats, FSM (idle/waiting_response/settings states),
SQLite local DB for tg_users+chats, converter, keyboards, and
handlers for /start, /new, /chats, /settings, confirm callbacks.

adapter/telegram/handlers/confirm.py

@@ -0,0 +1,49 @@
+# adapter/telegram/handlers/confirm.py
+from __future__ import annotations
+
+from aiogram import F, Router
+from aiogram.fsm.context import FSMContext
+from aiogram.types import CallbackQuery
+
+from core.handler import EventDispatcher
+from core.protocol import IncomingCallback
+
+router = Router(name="confirm")
+
+
+@router.callback_query(F.data.startswith("confirm:"))
+async def handle_confirm(
+    callback: CallbackQuery,
+    state: FSMContext,
+    dispatcher: EventDispatcher,
+) -> None:
+    parts = callback.data.split(":", 2)
+    _, decision, action_id = parts  # "yes" or "no"
+
+    data = await state.get_data()
+    chat_id = data.get("active_chat_id", "")
+    chat_name = data.get("active_chat_name", "Чат")
+
+    from adapter.telegram import db as tgdb
+    tg_id = callback.from_user.id
+    tg_user = tgdb.get_or_create_tg_user(tg_id, str(tg_id), callback.from_user.full_name)
+    platform_user_id = tg_user.get("platform_user_id", str(tg_id))
+
+    incoming = IncomingCallback(
+        user_id=platform_user_id,
+        platform="telegram",
+        chat_id=chat_id,
+        action="confirm" if decision == "yes" else "cancel",
+        payload={"action_id": action_id},
+    )
+    events = await dispatcher.dispatch(incoming)
+
+    await callback.message.edit_reply_markup(reply_markup=None)
+
+    for event in events:
+        from core.protocol import OutgoingMessage, OutgoingUI
+        from adapter.telegram.converter import format_outgoing
+        if isinstance(event, (OutgoingMessage, OutgoingUI)):
+            await callback.message.answer(format_outgoing(chat_name, event))
+
+    await callback.answer()