feat(smart-app): implement complete mobile app MVP

- App.tsx: full navigation (Auth stack + Main tabs with 5 screens)
- Auth: LoginScreen, RegisterScreen, ForgotPasswordScreen
- HomeScreen: dashboard with IoT metrics, weather widget, alerts, quick actions, sensors
- MapScreen: interactive map with layer toggles (6 layers)
- MarketplaceScreen: categories (6), products (5), search
- ChatScreen: AI chat with quick prompts (4), bot responses
- ProfileScreen: user info, stats, menu (9 items), logout
- AlertsScreen: alert list with severity, acknowledge
- SensorsScreen: sensor list with type filters (6 types), search
- ZonesScreen: zone cards with stats
- SettingsScreen: language picker (FR/EN/ES/DE), privacy, about
- Stores: iotStore (sensors, zones, alerts), notificationStore, uiStore + i18n
- Hooks: useSensors, useAlerts, useNotifications, useLocation
- Components: Card, Button, LoadingSpinner, ErrorBoundary, Header
- Services: iotService, notificationService (with axios API client)
- Utils: formatters (temp, AQI, noise, dates), validators (email, password, IBAN)
- Theme: colors.ts with full design system (Blue Ocean palette)
- Ditto: fixed MongoDB connection, new JWT secrets, official gateway image

smart-app-city/frontend/node_modules/graphql/jsutils/promiseForObject.js.flow

@@ -0,0 +1,22 @@
+// @flow strict
+import type { ObjMap } from './ObjMap';
+
+/**
+ * This function transforms a JS object `ObjMap<Promise<T>>` into
+ * a `Promise<ObjMap<T>>`
+ *
+ * This is akin to bluebird's `Promise.props`, but implemented only using
+ * `Promise.all` so it will work with any implementation of ES6 promises.
+ */
+export default function promiseForObject<T>(
+  object: ObjMap<Promise<T>>,
+): Promise<ObjMap<T>> {
+  const keys = Object.keys(object);
+  const valuesAndPromises = keys.map((name) => object[name]);
+  return Promise.all(valuesAndPromises).then((values) =>
+    values.reduce((resolvedObject, value, i) => {
+      resolvedObject[keys[i]] = value;
+      return resolvedObject;
+    }, Object.create(null)),
+  );
+}