feat(backends install): allow to specify name and alias during manual installation

[mudler]

Description

This PR makes possible to specify name and alias when installing backends manually (not from the gallery):

local-ai backends install oci://<image>:tag --name "foo-backend" --alias "llama-cpp"
local-ai backends install ocifile://<image>:tag --name "foo-backend" --alias "llama-cpp"
local-ai backends install /local/dir/path --name "foo-backend" --alias "llama-cpp"

Notes for Reviewers

Signed commits

• Yes, I signed my commits.

[netlify]

✅ Deploy Preview for localai ready!

Name	Link
🔨 Latest commit	668d73c
🔍 Latest deploy log	https://app.netlify.com/projects/localai/deploys/68912281c4170f000955b599
😎 Deploy Preview	https://deploy-preview-5971--localai.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.