Hover link on `image:` field in compose.yaml always points to Docker Hub, even for private registries

[krave1986]

Describe the bug

When hovering over an image: field in a compose.yaml file, the extension generates a link pointing to https://hub.docker.com/r/<image>, even when the image reference includes a private registry hostname.

For example, with the following Compose service:

services:
  code-sync:
    image: nrt.vultrcr.com/wulicoco/code-sync

Hovering over the image value shows:
https://hub.docker.com/r/nrt.vultrcr.com/wulicoco/code-sync

This is incorrect — nrt.vultrcr.com is a private Vultr Container Registry, not Docker Hub.

Expected behavior

The extension should detect that the image reference includes a registry hostname (a domain with a TLD, such as nrt.vultrcr.com) and either:

• Generate a correct link to the private registry

Steps to reproduce

1. Create a compose.yaml with an image: field referencing a private registry, e.g. nrt.vultrcr.com/myorg/myimage
2. Hover over the image value in the editor
3. The hover tooltip shows a link incorrectly pointing to hub.docker.com

Environment

• OS: Linux
• VS Code version:
  Version: 1.109.5 (system setup)
  Commit: 072586267e68ece9a47aa43f8c108e0dcbf44622
  Date: 2026-02-19T19:43:32.382Z
  Electron: 39.3.0
  ElectronBuildId: 13313481
  Chromium: 142.0.7444.265
  Node.js: 22.21.1
  V8: 14.2.231.22-electron.0
  OS: Windows_NT x64 10.0.19045
• Container Tools extension version: 2.4.1