feat: support redis rate limiting

backend/providers/http/config.go

@@ -34,6 +34,15 @@ type RateLimit struct {
 	WindowSeconds int
 	Message       string
 	SkipPaths     []string
+	Redis         *RateLimitRedis
+}
+
+type RateLimitRedis struct {
+	Addrs    []string
+	Username string
+	Password string
+	DB       int
+	Prefix   string
 }
 
 type Whitelist struct {