feat(bot): Telegram через прокси (TELEGRAM_PROXY_URL); лимит памяти бота 384m

С сервера Vobot api.telegram.org недоступен (ни IPv4, ни IPv6) — как и meditron, ходим
через прокси; aiohttp-socks для http/socks. Бот в простое ~190 МБ — 256m мало.

Refs #12

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

app/config.py

@@ -13,6 +13,8 @@ class TelegramSettings(BaseSettings):
     model_config = SettingsConfigDict(**_ENV, env_prefix="TELEGRAM_")
 
     bot_token: SecretStr
+    # http://user:pass@host:port or socks5://… — the RF server has no route to api.telegram.org (same as meditron)
+    proxy_url: SecretStr | None = None
 
 
 class AccessSettings(BaseSettings):

app/main.py

@@ -5,6 +5,7 @@ import contextlib
 import logging
 
 from aiogram import Bot, Dispatcher
+from aiogram.client.session.aiohttp import AiohttpSession
 
 from app import __version__
 from app.access.service import AccessService
@@ -54,8 +55,15 @@ async def run(settings: Settings) -> None:
         asyncio.create_task(heartbeat(rt.heartbeat_file, rt.heartbeat_interval)),
         asyncio.create_task(cleanup_loop(sessions)),
     ]
-    bot = Bot(settings.telegram.bot_token.get_secret_value())
-    log.info("tgit %s starting, %d bootstrap admin(s)", __version__, len(settings.access.admin_ids))
+    proxy = settings.telegram.proxy_url
+    session = AiohttpSession(proxy=proxy.get_secret_value()) if proxy else None
+    bot = Bot(settings.telegram.bot_token.get_secret_value(), session=session)
+    log.info(
+        "tgit %s starting, %d bootstrap admin(s), telegram %s",
+        __version__,
+        len(settings.access.admin_ids),
+        "via proxy" if proxy else "direct",
+    )
     try:
         await dp.start_polling(bot, handle_signals=True)
     finally: