Start at the factory, add PWA install and GPS real-world mode

The game now begins inside the Negin Sazan Pishgam Radmehr Atousa
vending-machine factory on the Mashhad–Chenaran road, and the world
extends ~20 km along the real driving route to Park Mellat and
Ferdowsi University.

- Factory compound: production hall with assembly line, office, yard,
  gate and company signs; first mission at its half-price demo machine
- Map data merged from four OSM extracts (factory zone, route corridor,
  region main roads, city zone), clipped to a 15 x 18 km region
- City meshes chunked and culled by distance; traffic recycled around
  the player; minimap and city map drawn from cached tiles + overview
- The Robot Market robot no longer walks with the family: it comes out
  of a machine when they arrive, greets them with expression portraits
  and goes back inside when they leave
- PWA: manifest, icons from the robot avatar, offline service worker
  generated at build time, install button / iOS steps, update prompt;
  Vazirmatn font bundled instead of Google Fonts
- Real-world mode: safety notice, GPS + compass tracking with accuracy
  smoothing, 20-40 m arrival radius, speed lock and in-person bonus

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

package-lock.json

@@ -9,6 +9,7 @@
       "version": "1.0.0",
       "license": "ISC",
       "dependencies": {
+        "@fontsource/vazirmatn": "^5.2.5",
         "three": "^0.180.0"
       },
       "devDependencies": {
@@ -457,6 +458,15 @@
         "node": ">=18"
       }
     },
+    "node_modules/@fontsource/vazirmatn": {
+      "version": "5.2.5",
+      "resolved": "https://registry.npmjs.org/@fontsource/vazirmatn/-/vazirmatn-5.2.5.tgz",
+      "integrity": "sha512-rWQH9i4Zp/64tQTHhy/ijOzdC50kXuBSPDEYDs63TI7EMMG5VzrQrVj6qroIsw6glHumJzpY6tayX4hWCR4RQA==",
+      "license": "OFL-1.1",
+      "funding": {
+        "url": "https://github.com/sponsors/ayuhito"
+      }
+    },
     "node_modules/@napi-rs/lzma-linux-x64-gnu": {
       "version": "1.5.1",
       "resolved": "https://registry.npmjs.org/@napi-rs/lzma-linux-x64-gnu/-/lzma-linux-x64-gnu-1.5.1.tgz",