chore: adjust the internal code structure of the dns module

context/dns.go

@@ -2,10 +2,10 @@ package context
 
 import (
 	"context"
+
 	"github.com/metacubex/mihomo/common/utils"
 
 	"github.com/gofrs/uuid/v5"
-	"github.com/miekg/dns"
 )
 
 const (
@@ -17,17 +17,15 @@ const (
 type DNSContext struct {
 	context.Context
 
-	id  uuid.UUID
-	msg *dns.Msg
-	tp  string
+	id uuid.UUID
+	tp string
 }
 
-func NewDNSContext(ctx context.Context, msg *dns.Msg) *DNSContext {
+func NewDNSContext(ctx context.Context) *DNSContext {
 	return &DNSContext{
 		Context: ctx,
 
-		id:  utils.NewUUIDV4(),
-		msg: msg,
+		id: utils.NewUUIDV4(),
 	}
 }