fix(youtube): correct extractor-args separator, soften worker recycling, retry video upload

EXTRACTOR_ARGS used ':' instead of ';' between player_client and skip
fields, so yt-dlp parsed "android:skip=translated_subs" and "hls" as
bogus player_client values and silently fell back to the web client
only, which fails the n-challenge and returns no formats.

--max-requests=1 fully restarted the gunicorn worker after every
single request, opening a race window that could drop the response
connection right after a successful download; raised to 20 with
jitter to keep the periodic-recycle safety net without doing it on
every request.

reply_video() to Telegram had no retry, so a transient httpx
transport error during upload discarded an already-downloaded video;
added the same 3-attempt retry pattern already used for the
downloader services.

bot.py

@@ -576,25 +576,37 @@ async def process_queue_item(item: QueueItem):
         # Отправляем файл пользователю
         await item.status_message.edit_text(get_text(item.locale, 'sending'))
         
-        video_file = open(video_path, 'rb')
         caption = get_text(item.locale, 'caption', bot_username=TELEGRAM_BOT_USERNAME)
         caption += f"\n\n{item.url}"
-        
+
         # Определяем имя файла для отправки
         video_filename = Path(video_path).name
-        
-        # Отправляем как видео со streaming — встроенный плеер Telegram
-        await item.original_message.reply_video(
-            video=video_file,
-            filename=video_filename,
-            caption=caption,
-            supports_streaming=True,
-            read_timeout=600,
-            write_timeout=600,
-            connect_timeout=60,
-            pool_timeout=60
-        )
-        video_file.close()
+
+        # Отправляем как видео со streaming — встроенный плеер Telegram.
+        # Загрузка большого файла в Telegram API иногда обрывается транспортной
+        # ошибкой httpx (ReadError/RemoteProtocolError) — ретраим, открывая файл заново.
+        send_retries = 3
+        for attempt in range(send_retries):
+            video_file = open(video_path, 'rb')
+            try:
+                await item.original_message.reply_video(
+                    video=video_file,
+                    filename=video_filename,
+                    caption=caption,
+                    supports_streaming=True,
+                    read_timeout=600,
+                    write_timeout=600,
+                    connect_timeout=60,
+                    pool_timeout=60
+                )
+                break
+            except Exception as send_error:
+                if attempt == send_retries - 1:
+                    raise
+                logger.warning(f"Отправка видео: попытка {attempt + 1}/{send_retries} не удалась: {send_error}")
+                await asyncio.sleep((attempt + 1) * 2)
+            finally:
+                video_file.close()
         
         # Увеличиваем счетчик скачанных видео
         increment_downloads()