feat: Telegram bot — full functionality with inline keyboards, file upload, auth

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/messengers/telegram/bot.py

@@ -0,0 +1,59 @@
+from aiogram import Bot, Dispatcher
+from aiogram.webhook.aiohttp_server import SimpleRequestHandler
+from fastapi import APIRouter, Request, Response
+
+from app.config import settings
+from app.messengers.base import MessengerService
+from app.messengers.telegram.handlers import router as handlers_router
+
+api_router = APIRouter()
+
+
+class TelegramService(MessengerService):
+    def __init__(self):
+        self.bot = Bot(token=settings.telegram_bot_token)
+        self.dp = Dispatcher()
+        self.dp.include_router(handlers_router)
+
+    async def setup(self):
+        if settings.telegram_webhook_url:
+            await self.bot.set_webhook(
+                settings.telegram_webhook_url,
+                drop_pending_updates=True,
+            )
+
+    async def shutdown(self):
+        await self.bot.delete_webhook()
+        await self.bot.session.close()
+
+    async def send_message(self, chat_id: str, text: str, **kwargs):
+        await self.bot.send_message(int(chat_id), text, **kwargs)
+
+    async def send_file(self, chat_id: str, file_path: str, caption: str = ""):
+        from aiogram.types import FSInputFile
+        await self.bot.send_document(
+            int(chat_id),
+            FSInputFile(file_path),
+            caption=caption,
+        )
+
+    async def notify_progress(self, chat_id: str, status: str, progress: int | None = None):
+        text = f"⚙️ {status}"
+        if progress is not None:
+            bar = "▓" * (progress // 10) + "░" * (10 - progress // 10)
+            text += f"\n{bar} {progress}%"
+        await self.send_message(chat_id, text)
+
+    async def feed_webhook(self, request: Request) -> Response:
+        update = await request.json()
+        from aiogram.types import Update
+        await self.dp.feed_update(self.bot, Update(**update))
+        return Response(status_code=200)
+
+
+telegram_service = TelegramService()
+
+
+@api_router.post("/api/telegram/webhook")
+async def telegram_webhook(request: Request):
+    return await telegram_service.feed_webhook(request)