v0.1.0: first Rust port of TicketTracker

Replaces the .NET 8/ASP.NET Core/EF Core/Photino.NET app with an
axum + rusqlite backend (tickets-server), a Tauri desktop shell
(tickets-app), and a standalone self-update helper (tickets-updater).
Motivating fix: iOS 12 Safari camera-permission bug in barcode
scanning, root-caused against the real vendored Quagga2 library and
fixed by calling Quagga.init() once per session instead of per scan.

Starting with a fresh database -- the old .NET app never worked
reliably in production, so this is not a data migration.