Voice mode dowload fails with corporate proxy ENOTFOUND

### Describe the bug

[apply-foundry-proxy-patch.js](https://github.com/user-attachments/files/29883462/apply-foundry-proxy-patch.js)

The download of the voice mode inference runtime failed with "Error: Failed to download Microsoft.AI.Foundry.Local.Core 1.2.3 from any configured feed (api.nuget.org, pkgs.dev.azure.com): getaddrinfo ENOTFOUND pkgs.dev.azure.com" behind the corporate proxy despite proper setup of Px and env vars.

Root cause: the vendored `foundry-local-sdk/script/install-utils.cjs` downloads NuGet packages using a bare `https.get()` call. Node's built-in `http`/`https` modules never read HTTP_PROXY/HTTPS_PROXY env vars on their own (unlike curl or most other tools), so the request bypasses the proxy entirely and fails to resolve DNS/connect directly.

Additionally, `copilot.exe` is a compiled Node "Single Executable Application" (SEA) binary that silently ignores NODE_OPTIONS, so the usual `-r some-proxy-shim.js` / `global-agent` tricks do NOT work here — the shim never loads inside the actual copilot process or its worker threads.

See attached file for temporary workaround.

### Affected version

GitHub Copilot CLI 1.0.70

### Steps to reproduce the behavior

Enter /voice on
Confirm download of model
Observe download failure

### Expected behavior

Setup behind corporate proxy is supported.

### Additional context

_No response_

Bắt đầu với vendored foundry-local-sdk/script/install-utils.cjs và kiểm tra workaround apply-foundry-proxy-patch.js đính kèm, sau đó tái hiện quá trình tải xuống /voice bằng môi trường proxy được báo cáo. Hoàn thành có nghĩa là package Microsoft.AI.Foundry.Local.Core được tải xuống thành công thông qua proxy doanh nghiệp đã cấu hình mà không phụ thuộc vào NODE_OPTIONS.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.