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/polyfills/arrayFrom.mjs

@@ -0,0 +1,49 @@
+import { SYMBOL_ITERATOR } from "./symbols.mjs";
+
+/* eslint-disable no-redeclare */
+// $FlowFixMe[name-already-bound]
+var arrayFrom = Array.from || function (obj, mapFn, thisArg) {
+  if (obj == null) {
+    throw new TypeError('Array.from requires an array-like object - not null or undefined');
+  } // Is Iterable?
+
+
+  var iteratorMethod = obj[SYMBOL_ITERATOR];
+
+  if (typeof iteratorMethod === 'function') {
+    var iterator = iteratorMethod.call(obj);
+    var result = [];
+    var step;
+
+    for (var i = 0; !(step = iterator.next()).done; ++i) {
+      result.push(mapFn.call(thisArg, step.value, i)); // Infinite Iterators could cause forEach to run forever.
+      // After a very large number of iterations, produce an error.
+      // istanbul ignore if (Too big to actually test)
+
+      if (i > 9999999) {
+        throw new TypeError('Near-infinite iteration.');
+      }
+    }
+
+    return result;
+  } // Is Array like?
+
+
+  var length = obj.length;
+
+  if (typeof length === 'number' && length >= 0 && length % 1 === 0) {
+    var _result = [];
+
+    for (var _i = 0; _i < length; ++_i) {
+      if (Object.prototype.hasOwnProperty.call(obj, _i)) {
+        _result.push(mapFn.call(thisArg, obj[_i], _i));
+      }
+    }
+
+    return _result;
+  }
+
+  return [];
+};
+
+export default arrayFrom;