Produce a portable Windows .zip for first-class Scoop support

[Razee4315]

We have a Scoop manifest in packaging/scoop/marklite.json, but it's marked experimental because it extracts the NSIS installer via the #/dl.7z trick. Scoop is happiest with a portable app, which MarkLite doesn't currently produce.

What to do

• Add a build step (in release.yml or a small script) that zips the unpacked MarkLite.exe + its resources into MarkLite_<version>_x64-portable.zip, and attach it to the release.
• Update packaging/scoop/marklite.json to point url at the zip (drop the #/dl.7z and bin/extract_dir workarounds) and verify scoop install works.

Acceptance

• scoop install ./packaging/scoop/marklite.json installs and runs MarkLite cleanly.
• Eligible to submit to the Scoop extras bucket.

See packaging/README.md for context.

[adityabhatkar23]

@Razee4315 i would like to work on this issue

[skycommand]

I'd advise against Scoop altogether. It doesn't play nice with Windows security boundaries. Its packages break easily and are a nightmare to maintain (that is, if you care about maintaining them).

I suggest WinGet. It comes preconfigured in Windows 11 and is available on Windows 10 with first automatic app update from Microsoft Store. WinGet plays nice with security and is very popular.