fix(agent/windows): named pipe Tailscale + hideWindow + logs

- Use Windows named pipe \.\pipe\studioe5-tailscaled instead of Unix socket
- Apply hideWindow to all child processes (tailscale, podman, docker, browser)
- Redirect agent logs to <data-dir>/agent.log and tailscaled logs to tailscaled.log
- Fix double tailscale/ tailscale dir path in startTailscaleAndReport
- Remove --operator=root on Windows
- Bump agent version to 0.3.1

agent/instance.go

@@ -88,6 +88,7 @@ func getInstanceStatus(dataDir, instanceID string) string {
 
 	// Try modern JSON format first
 	cmd := exec.Command(engine, "compose", "-f", composeFile, "ps", "--format", "json")
+	hideWindow(cmd)
 	out, err := cmd.Output()
 	if err == nil {
 		outStr := strings.TrimSpace(string(out))
@@ -119,6 +120,7 @@ func getInstanceStatus(dataDir, instanceID string) string {
 
 	// Fallback: use "ps -q" which is supported by all docker-compose versions
 	cmd = exec.Command(engine, "compose", "-f", composeFile, "ps", "-q")
+	hideWindow(cmd)
 	out, err = cmd.Output()
 	if err != nil {
 		return "error"