Restructured project

- backend moved to backend directory
- added and initialized frontend with vue
- moved infrastructure files to infra directory

backend/src/domain/auth.go

@@ -0,0 +1,7 @@
+package domain
+
+type AuthRequest struct {
+	TelegramId *string `json:"telegram_id"`
+	OTP        *int64  `json:"otp"`
+	InitData   *string `json:"init_data"`
+}