feat: initial implementation of uptodownbot

Telegram bot for downloading media from any site using yt-dlp.
Supports audio/video/both, quality selection, language picker,
container format selection, playlist pagination, progress updates,
per-user quotas, user preferences, download history, cancel at any step,
polling and webhook modes, proxy support, and SQLite persistence.

docker-compose.yml

@@ -0,0 +1,21 @@
+services:
+  uptodown-bot:
+    build:
+      context: .
+      args:
+        HTTP_PROXY: ${HTTP_PROXY}
+        HTTPS_PROXY: ${HTTPS_PROXY}
+    env_file:
+      - .env
+    environment:
+      - BOT_TOKEN=${BOT_TOKEN}
+      - HTTP_PROXY=${HTTP_PROXY}
+      - HTTPS_PROXY=${HTTPS_PROXY}
+      - DB_PATH=${DB_PATH}
+      - TZ=${TZ}
+    volumes:
+      - uptodown_data:/data
+
+volumes:
+  uptodown_data:
+    driver: local