Fix/qa defects df002 df011 (#9)

## Summary

What changed and why?

## Change Type

- [ ] Cowork feature
- [ ] Bug fix
- [ ] Core AI contribution
- [ ] Test / hardening
- [ ] Performance
- [ ] Documentation

## Related Work

Cowork Task:

Core Repo: http://34.143.229.138/gitea-admin/fsg-ai-core-assets

Core AI Issue:

Core Task:

Related PR:

## Scope

What is intentionally included?

What is intentionally NOT included?

## Validation

- [ ] Unit tests
- [ ] Integration tests
- [ ] Manual verification
- [ ] Regression check

Commands / evidence:

## Security Impact

Permission / credential / network / customer data impact:

## Compatibility

- [ ] No breaking change
- [ ] Breaking change documented

## Reviewer Notes

Anything Cowork reviewers should pay attention to.

---------

Co-authored-by: thanhnv <thanhnv.ip@gmail.com>
Co-authored-by: Vu Dam Tuan <vudt15@fpt.com>
Reviewed-on: #9

scripts/console_visibility.ps1

@@ -0,0 +1,22 @@
+<#
+.SYNOPSIS
+    Ẩn/hiện cửa sổ console hiện tại — dùng bởi run.bat để không hiện cửa sổ
+    cmd đen suốt phiên chạy app (app là GUI Qt, không cần console), nhưng vẫn
+    hiện lại được nếu app thoát lỗi để người dùng đọc thông báo.
+
+.PARAMETER Mode
+    0 = ẩn (SW_HIDE), 5 = hiện lại (SW_SHOW).
+#>
+param(
+    [int]$Mode = 0
+)
+
+Add-Type -Name Win32 -Namespace CoworkLocalNative -MemberDefinition @"
+[DllImport("user32.dll")] public static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);
+[DllImport("kernel32.dll")] public static extern IntPtr GetConsoleWindow();
+"@
+
+$hwnd = [CoworkLocalNative.Win32]::GetConsoleWindow()
+if ($hwnd -ne [IntPtr]::Zero) {
+    [CoworkLocalNative.Win32]::ShowWindow($hwnd, $Mode) | Out-Null
+}