refactor: move shared modules out of app/

`app/` should hold route segments only. Game logic and the player-card
component are imported by both routes, so they belong outside:

  app/loto-game-logic.ts   -> lib/game-logic.ts
  app/loto-player-board.tsx -> components/player-board.tsx

Imports use the existing @/* alias. Drops the redundant `loto-` prefix.
Also fixes the package name from the scaffold default.

web/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "nextjs-temp",
+  "name": "loto",
   "version": "0.1.0",
   "private": true,
   "scripts": {