ratelimit

type Config struct {
	// Global rate limiting (across all users)
	GlobalEnabled bool
	GlobalLimit   int           // requests per window
	GlobalWindow  time.Duration // time window
	GlobalBurst   int           // burst capacity

	// Per-wallet rate limiting (identified by wallet address)
	PerWalletEnabled bool
	PerWalletLimit   int
	PerWalletWindow  time.Duration
	PerWalletBurst   int

	// Per-IP rate limiting (fallback when wallet not identified)
	PerIPEnabled bool
	PerIPLimit   int
	PerIPWindow  time.Duration
	PerIPBurst   int

	// Metrics collector (optional)
	Metrics *metrics.Metrics
}