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>

cmd/server/main.go

@@ -10,7 +10,7 @@ import (
 	"syscall"
 	"time"
 
-	"github.com/hits/ExploreDNS/web/api"
+	"gitea.hansenits.com.au/hits/ExploreDNS/web/api"
 )
 
 func main() {