Build driver app, Uber-style dispatch, POI suggestions; fix map tiles

Driver side (was a stub):
- In-app driver onboarding: a driver-role user creates their own linked
  drivers profile (driver/profile+api GET/POST/PATCH).
- Driver dashboard: online/offline toggle, today's earnings, incoming
  request cards (accept/decline), active ride panel (start/complete trip).
  Polls /driver/rides every 4s while online.
- Location heartbeat (use-driver-location): watchPositionAsync pings
  /driver/location every ~5s; restarts the watch on app foreground so a
  backgrounded driver doesn't go permanently stale and miss requests.

Dispatch (auto-match nearest, Uber-style):
- Ride state machine: requested -> accepted -> en_route -> completed/cancelled
  with a nullable driver_id until matched (lib/dispatch.matchNextDriver).
- matchNextDriver locks the ride (SELECT FOR UPDATE), expires 15s-stale
  offers, picks the nearest eligible driver of the matching service by
  haversine, offers one at a time. Called from ride/create, ride/[id] GET
  (lazy match on the rider's poll), and ride/[id]/respond (on decline).
- ride/create is now a request endpoint (driver_id NULL, status=requested,
  service); drops the pre-match driver_id payment reconciliation.
- ride/[id] GET returns status/service/nullable driver; PATCH handles rider
  cancel + driver en_route/completed. ride/list backs the history tabs.

Rider flow (best experience):
- confirm-ride is now a request screen: single trip fare + nearest-driver
  ETA + cash/card + Request Ride -> live status. Periodically polls online
  drivers of the selected service and disables Request when none are
  online (prevents the "stuck searching forever" state).
- book-ride is the live ride-status screen (searching -> accepted ->
  en_route -> completed/cancelled + Cancel), polling every 3s.
- lib/request-ride unifies the Areeba card flow + cash path.
- Map reads /driver/nearby (real positions, service-filtered); lib/map
  adds calculateTripFare + service-aware fares.

POI suggestions:
- lib/places (Google Nearby Search) + nearby-suggestions chips for
  mall/hospital/pharmacy/restaurant on the home screen.

Service categories now drive both matching and a per-service fare
multiplier (car 1.0 / moto 0.7 / courier 0.85 / chauffeur 1.5).

Map tiles: react-native-maps rendered blank on Android because no Google
Maps key was set. Switched app.json -> app.config.js so
android.config.googleMaps.apiKey is injected from
EXPO_PUBLIC_GOOGLE_API_KEY at build time (keeps the key out of git).
Requires a native rebuild (expo run:android) to take effect.

Also includes the prior payment/auth hardening (server-authoritative
payment_orders ledger with double-spend guards, peppered OTP, register
TOCTOU fix, stats cents fix) that was left uncommitted.

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

lib/pricing.ts

@@ -4,6 +4,8 @@
 // - Prices are quoted in USD (the de facto ride-hailing currency) with an
 //   L.B.P. equivalent shown for cash settlement.
 
+import { DEFAULT_SERVICE, SERVICES, type ServiceId } from "@/constants/services";
+
 export const FARE = {
   base: 1.5, // USD, flag drop
   perKm: 0.55, // USD per kilometer of the trip
@@ -14,18 +16,24 @@ export const FARE = {
 // Parallel market rate used for the L.B.P. cash equivalent shown in-app.
 export const LBP_RATE = 89500;
 
-export const calculateFare = ({
-  distanceMeters,
-  durationSeconds,
-}: {
-  distanceMeters: number;
-  durationSeconds: number;
-}): string => {
+export const calculateFare = (
+  {
+    distanceMeters,
+    durationSeconds,
+  }: {
+    distanceMeters: number;
+    durationSeconds: number;
+  },
+  service: ServiceId = DEFAULT_SERVICE,
+): string => {
   const km = distanceMeters / 1000;
   const minutes = durationSeconds / 60;
 
-  const fare = FARE.base + km * FARE.perKm + minutes * FARE.perMin;
+  const multiplier =
+    SERVICES.find((s) => s.id === service)?.fareMultiplier ?? 1;
+  const fare = (FARE.base + km * FARE.perKm + minutes * FARE.perMin) * multiplier;
 
+  // The minimum fare is a floor on the final amount.
   return Math.max(fare, FARE.minimum).toFixed(2);
 };