test(ws,browser): add test suites for ws and browser packages (#22)

- Add ws/server_test.go: WebSocket connection, namespace filtering, non-upgrade rejection, SetUpgrader
- Add ws/namespaces_test.go: NamespacesHandler response format and content
- Add browser/browser_test.go: template rendering, ws URL construction, trailing slash handling
- Fix goimports whitespace in ws/server.go

ws/server.go

@@ -23,7 +23,7 @@ func LogSocketHandler(w http.ResponseWriter, r *http.Request) {
 	if namespacesParam != "" {
 		namespaces = strings.Split(namespacesParam, ",")
 	}
-	
+
 	c, err := upgrader.Upgrade(w, r, nil)
 	if err != nil {
 		logger.Error("upgrade:", err)