Windows distribution: winget and Chocolatey packages

[cevheri]

Part of the distribution-channels epic #108.

Problem

Windows users ask for winget install / choco install. Both managers only need a manifest pointing at an installer or a portable zip — the real work is producing a Windows artifact.

Proposal

Two possible artifacts, in order of preference:

1. Portable zip / installer with the standalone build + bundled runtime and a libredb-studio.cmd launcher; optionally a Windows service via WinSW or NSSM for background operation.
2. Once the desktop-wrapper spike lands, its installer (MSI/NSIS from Tauri) becomes the artifact and winget/Chocolatey manifests point at that instead.

Steps for option 1:

• Produce a Windows (x64, later arm64) standalone artifact in release CI.
• Submit a winget manifest to microsoft/winget-pkgs; automate updates with wingetcreate in release CI.
• Publish a Chocolatey package (community repo) with automated pushes.

Constraints

• Native modules need Windows prebuilds; verify better-sqlite3/oracledb/mssql load on Windows.
• Code signing: unsigned binaries trigger SmartScreen; evaluate a signing certificate (or rely on winget's hash-based trust initially).

Depends on

• Zero-config first run.

Acceptance criteria

• winget install libredb.studio (and choco install libredb-studio) installs and the launcher serves the app.
• Manifest updates are automated on release.

[cevheri]

Note from PR #142 (Node 20.9 engines floor): the npx launcher now runs a runtime preflight (assessNodeRuntime in bin/lib/launcher-utils.mjs) - but only AFTER the existing win32 early-exit, so Windows users still get the Docker pointer, not a version message. When Windows packaging lands, the runtime-tier story needs a Windows companion: node:sqlite availability follows the same 22.13/24 line, but the bundled better-sqlite3 ABI and the standalone-tarball availability (currently linux/darwin only, enforced by artifactName) are platform-specific. The engine-matrix CI (scripts/engine-smoke.sh) should gain a windows-latest leg in the same change.