Turn the game into a third-person Mashhad city game

Replace the linear forest walk with an open area of real western Mashhad
built from OpenStreetMap data, starting at Park Mellat. A father and child,
guided by the Robot Market robot, find vending machines at a park, school,
universities, a metro station and a mall, on foot or by car.

- Iran province briefing map; only Mashhad is unlocked
- Third-person camera, building collision, arcade car and ambient traffic
- Minimap and full city map with addresses, opening hours and A* routing
- Purchase scoring, missions with cash rewards, ranks and an end screen
- Map data build script (OSM + Natural Earth) and new logic tests

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

package.json

@@ -1,8 +1,7 @@
 {
   "name": "game",
   "version": "1.0.0",
-  "description": "A Persian 3D forest walk and vending-machine game",
-  "main": "index.js",
+  "description": "A Persian third-person 3D city game: find Robot Market vending machines across real Mashhad streets",
   "scripts": {
     "dev": "vite --host 0.0.0.0",
     "build": "vite build",