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/coverage_test.go

@@ -6,7 +6,7 @@ import (
 	"testing"
 	"time"
 
-	dnsinternal "github.com/hits/ExploreDNS/internal/dns"
+	dnsinternal "gitea.hansenits.com.au/hits/ExploreDNS/internal/dns"
 	"github.com/miekg/dns"
 )