feat: implement output formatting and display (HAN-383)

Add text and JSON formatters with real-time progress via traverser hooks,
summary statistics, and CLI integration for --show-* and --json flags.

Co-authored-by: multica-agent <github@multica.ai>

internal/dns/types.go

@@ -1,6 +1,11 @@
 package dns
 
-import "github.com/miekg/dns"
+import (
+	"fmt"
+	"strings"
+
+	"github.com/miekg/dns"
+)
 
 const (
 	TypeA     uint16 = dns.TypeA
@@ -35,6 +40,32 @@ func QNameType(qtype uint16) string {
 	return dns.TypeToString[qtype]
 }
 
+func ParseQueryType(s string) (uint16, error) {
+	s = strings.ToUpper(strings.TrimSpace(s))
+	switch s {
+	case "A":
+		return TypeA, nil
+	case "AAAA":
+		return TypeAAAA, nil
+	case "NS":
+		return TypeNS, nil
+	case "CNAME":
+		return TypeCNAME, nil
+	case "MX":
+		return TypeMX, nil
+	case "TXT":
+		return TypeTXT, nil
+	case "SOA":
+		return TypeSOA, nil
+	case "PTR":
+		return TypePTR, nil
+	case "ANY":
+		return TypeANY, nil
+	default:
+		return 0, fmt.Errorf("invalid query type: %s", s)
+	}
+}
+
 func DefaultEDNS0UDPSize() int {
 	return 2048
 }