fix(bot): Telegram through TG_PROXY_URL — docker on the RF server has no IPv4 route to Telegram

Closes #108

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

app/channels/telegram.py

@@ -19,6 +19,7 @@ from typing import Protocol
 
 import yaml
 from aiogram import Bot, Dispatcher, F, Router
+from aiogram.client.session.aiohttp import AiohttpSession
 from aiogram.filters import CommandObject, CommandStart
 from aiogram.types import CallbackQuery, InlineKeyboardButton, InlineKeyboardMarkup, Message
 from pydantic import BaseModel
@@ -272,6 +273,12 @@ _task: asyncio.Task[None] | None = None
 _prev_outbox: Outbox | None = None
 
 
+def make_bot(token: str) -> Bot:
+    """aiogram `Bot`, through `TG_PROXY_URL` when it is set."""
+    proxy = get_settings().tg_proxy_url
+    return Bot(token, session=AiohttpSession(proxy=proxy)) if proxy else Bot(token)
+
+
 async def start() -> None:
     """Start polling if TG_BOT_TOKEN is set; no-op otherwise."""
     global _bot, _dp, _task, _prev_outbox
@@ -280,7 +287,7 @@ async def start() -> None:
         if not token:
             log.info("telegram disabled: TG_BOT_TOKEN is empty")
         return
-    bot = Bot(token)
+    bot = make_bot(token)
     channel = TelegramChannel(bot)
     dp = Dispatcher()
     dp.include_router(build_router(channel))