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.

internal/repo/interface.go

@@ -0,0 +1,27 @@
+package repo
+
+import "uptodownBot/internal/domain"
+
+type Repository interface {
+	// Users
+	GetOrCreateUser(chatID int64) (int64, error)
+
+	// Preferences
+	GetOrCreatePreferences(userID int64) (*domain.UserPreferences, error)
+	UpdatePreferences(userID int64, prefs *domain.UserPreferences) error
+
+	// Quotas
+	GetOrCreateQuotas(userID int64) (*domain.UserQuotas, error)
+	UpdateQuotas(userID int64, q *domain.UserQuotas) error
+
+	// Download history
+	AddHistory(userID int64, record *domain.DownloadRecord) error
+	GetHistory(userID int64, limit, offset int) ([]domain.DownloadRecord, error)
+	GetHistoryCount(userID int64) (int, error)
+
+	// Account
+	DeleteUserData(userID int64) error
+
+	// Lifecycle
+	Close() error
+}