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>

tests/world.test.js

@@ -5,7 +5,7 @@ import {toLocal, toLatLon, bearing, ORIGIN} from '../src/geo.js';
 import {createCollisionWorld, resolveCircle, blocked, clearFraction} from '../src/collision.js';
 import {buildGraph, routeBetween, nearestSegment, buildSegmentIndex} from '../src/routing.js';
 import {createCar, stepCar} from '../src/vehicle.js';
-import {machines} from '../src/locations.js';
+import {machines, machineById, FACTORY} from '../src/locations.js';
 
 const data = JSON.parse(readFileSync(new URL('../src/data/mellat.json', import.meta.url)));
 
@@ -27,10 +27,12 @@ test('Circles are pushed out of footprints and segments stop at walls', () => {
     assert.ok(Math.abs(clearFraction(world, -10, 5, 10, 5) - .5) < .06);
 });
 
-test('Real map: every machine is reachable on foot and by car from the start', () => {
+test('Real map: the factory connects by car to the city, and every city machine is reachable', () => {
     const walk = buildGraph(data.roads), drive = buildGraph(data.roads, {drivable: true});
-    const start = machines[0].anchor;
-    for (const m of machines) {
+    const toCity = routeBetween(drive, FACTORY.center.x, FACTORY.center.z, -445.8, -275.7);
+    assert.ok(toCity && toCity.length > 18000 && toCity.length < 23000, `factory → Park Mellat is ~20 km (${toCity?.length})`);
+    const start = machineById('mellat-park').anchor;
+    for (const m of machines.filter(m => m.anchor)) {
         const onFoot = routeBetween(walk, start.x, start.z, m.anchor.x, m.anchor.z);
         assert.ok(onFoot, `walk route to ${m.id}`);
         assert.ok(onFoot.length >= Math.hypot(m.anchor.x - start.x, m.anchor.z - start.z) - 1);