fix: rename Go module path to gitea.hansenits.com.au/hits/ExploreDNS

- Update go.mod module declaration
- Update all internal import paths in .go files
- Update go install lines in README.md

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: multica-agent <github@multica.ai>

internal/traverse/referral_test.go

@@ -4,7 +4,7 @@ import (
 	"net"
 	"testing"
 
-	"github.com/hits/ExploreDNS/internal/dns"
+	"gitea.hansenits.com.au/hits/ExploreDNS/internal/dns"
 )
 
 const TypeA = dns.TypeA