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.

Makefile

@@ -0,0 +1,38 @@
+BINARY=uptodown-bot
+BUILD_DIR=.build
+
+.PHONY: all build run test clean fmt tidy vet check docker docker-run
+
+all: build test check
+
+build:
+	go build -o $(BUILD_DIR)/$(BINARY) ./cmd/bot/
+
+run: build
+	$(BUILD_DIR)/$(BINARY)
+
+run-dev:
+	go run ./cmd/bot/
+
+test:
+	go test ./...
+
+fmt:
+	go fmt ./...
+
+tidy:
+	go mod tidy
+
+vet:
+	go vet ./...
+
+check: fmt vet
+
+clean:
+	rm -rf $(BUILD_DIR)
+
+docker:
+	docker compose build
+
+docker-run: docker
+	docker compose up -d