Add optional Linux installer bundle for AppImage releases

[kryptobaseddev]

What Changed

This adds a new linux-installer/ directory with an optional desktop-focused Linux installer for the existing AppImage release assets.

The installer downloads the latest T3 Code AppImage from GitHub Releases, installs it into standard Linux paths, adds desktop entries and icons, falls back to --appimage-extract-and-run when FUSE is unavailable, and exposes update/reinstall/uninstall actions through the launcher.

This PR also wires that bundle into the existing docs so Linux users can discover it without changing the primary release model.

Why

The AppImage should remain the main Linux artifact, but it does not integrate consistently across real Linux desktop setups.

This keeps the current release strategy intact while offering an optional helper for users who need:

• desktop integration that works out of the box
• a FUSE fallback on systems where AppImage does not mount cleanly
• a cleaner install/update/uninstall experience than manually handling the raw AppImage

This is intended to complement the Linux desktop identity work in #1201, not replace it.

Interim companion repo

For independent testing/distribution while this is under review:

• https://github.com/kryptobaseddev/t3code-linux-installer
• https://github.com/kryptobaseddev/t3code-linux-installer/releases/tag/v0.1.0

Scope

• new linux-installer/ bundle
• minimal README/docs updates pointing Linux users to it
• no change to the existing AppImage release artifact itself

Checklist

• This PR is small and focused
• I explained what changed and why
• This keeps the AppImage as the primary Linux artifact

Note

Add optional Linux installer bundle for AppImage releases

• Adds linux-installer/install-t3-code-linux.sh, a Bash installer that fetches the latest AppImage from GitHub Releases, installs it per-user (~/.local) or system-wide (/opt, /usr/local), and sets up desktop entries, icons, and launcher scripts.
• Detects FUSE 2 availability and falls back to --appimage-extract-and-run when absent.
• Generates t3-code-run, t3-code-update, and t3-code-uninstall helper scripts and a .desktop entry with Update/Reinstall/Uninstall actions.
• Bundles 256px and 512px icons in linux-installer/assets/icons/ and copies the installer bundle into the install directory for later maintenance.
• Documents the bundle in README.md, docs/release.md, and linux-installer/README.md; the AppImage remains the primary release artifact and this bundle is shipped separately as a .tar.gz.

^{Macroscope summarized ac7e8ce.}

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[Chrono-byte]

This is not the responsibility of a given application. You should be using a tool like Gear Lever or AppImageInstaller.