add default empty config for DNS, rename struct from DNSConfig to DNS

config.go

@@ -28,7 +28,7 @@ type Config struct {
 	AutoNAT   AutoNATConfig
 	Pubsub    PubsubConfig
 	Peering   Peering
-	DNS       DNSConfig
+	DNS       DNS
 
 	Provider     Provider
 	Reprovider   Reprovider

dns.go

 package config
 
-// DNSConfig specifies DNS resolution rules using custom resolvers
-type DNSConfig struct {
-	// Resolvers is a map of FQDNs to URLs for custom DNS resolution. 
+// DNS specifies DNS resolution rules using custom resolvers
+type DNS struct {
+	// Resolvers is a map of FQDNs to URLs for custom DNS resolution.
 	// URLs starting with `https://` indicate DoH endpoints.
 	// Support for other resolver types can be added in the future.
 	// https://en.wikipedia.org/wiki/Fully_qualified_domain_name
-	// https://en.wikipedia.org/wiki/DNS_over_HTTPS 
-	// 
+	// https://en.wikipedia.org/wiki/DNS_over_HTTPS
+	//
 	// Example:
 	// - Custom resolver for ENS:          `eth.` → `https://eth.link/dns-query`
 	// - Override the default OS resolver: `.`    → `https://doh.applied-privacy.net/query`

init.go

@@ -89,6 +89,9 @@ func InitWithIdentity(identity Identity) (*Config, error) {
 		Pinning: Pinning{
 			RemoteServices: map[string]RemotePinningService{},
 		},
+		DNS: DNS{
+			Resolvers: map[string]string{},
+		},
 	}
 
 	return conf, nil