Publish Chocolatey package

[AThraen]

Summary

Add a Chocolatey package alongside the existing winget release so Windows users with Chocolatey can install / upgrade CSM via `choco install codeshellmanager`.

Background

Releases already produce a signed MSI installer (`.github/workflows/build.yml`) and auto-submit it to winget (`.github/workflows/winget.yml` via vedantmgoyal9/winget-releaser) on the `release: released` event. Chocolatey is the other major Windows package manager and a one-liner install path for many developers.

What's needed

• A `.chocolatey/` folder with the package skeleton: `codeshellmanager.nuspec`, `tools/chocolateyinstall.ps1`, `tools/chocolateyuninstall.ps1`, `tools/LICENSE.txt`, `tools/VERIFICATION.txt`
• Install script: download the signed MSI from the GitHub Release for the matching version (URL pattern `https://github.com/umage-ai/CodeShellManager/releases/download/v\$version/CodeShellManager-\$version.msi\`), verify SHA256, run `Install-ChocolateyInstallPackage` with msi installer type
• Uninstall script: `Uninstall-ChocolateyPackage` against the recorded MSI product code
• New workflow `.github/workflows/chocolatey.yml` triggered on `release: released` (mirroring `winget.yml`):
  • Download the MSI from the just-published release
  • Compute the SHA256 and template it into `chocolateyinstall.ps1`
  • `choco pack` and `choco push` to community.chocolatey.org with `CHOCO_API_KEY` repo secret
  • Should be `workflow_dispatch`-able with a `tag` input for backfill / retry

Open questions

• Initial package submission to chocolatey.org requires moderator review (single-maintainer or team account?). After approval, automated pushes typically go through faster
• Whether to also publish the portable ZIP as a separate `codeshellmanager.portable` package (Chocolatey convention) — initial scope: just the MSI install
• Icon: chocolatey wants a square icon URL; check whether the existing app icon can be hosted from raw.githubusercontent.com or needs a separate CDN

Notes

• Maintainer needs a chocolatey.org account; package id `codeshellmanager` (or `umage-codeshellmanager` if the bare name is taken)
• Add a `CHOCO_API_KEY` secret once the account exists
• After the first successful publish, document the install command in README alongside the winget one