Add support for PostgreSQL 18 on Windows: new winget input manifest and
per-machine installer/uninstaller PowerShell scripts; outputs metadata
for version 18.4-1 (installer URL, sha256, and script refs) and app
registration in apps.json. Also add frontend icon component and 60x60
image asset, and update icons index to include the new icon. This
enables silent install/uninstall via the EnterpriseDB (BitRock)
installer and exposes the app in the software listing.
Allen Houchins
23da237942
