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/fbjs/lib/flatMapArray.js

@@ -0,0 +1,38 @@
+"use strict";
+
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * 
+ * @typechecks
+ */
+var push = Array.prototype.push;
+/**
+ * Applies a function to every item in an array and concatenates the resulting
+ * arrays into a single flat array.
+ *
+ * @param {array} array
+ * @param {function} fn
+ * @return {array}
+ */
+
+function flatMapArray(array, fn) {
+  var ret = [];
+
+  for (var ii = 0; ii < array.length; ii++) {
+    var result = fn.call(array, array[ii], ii);
+
+    if (Array.isArray(result)) {
+      push.apply(ret, result);
+    } else if (result != null) {
+      throw new TypeError('flatMapArray: Callback must return an array or null, ' + 'received "' + result + '" instead');
+    }
+  }
+
+  return ret;
+}
+
+module.exports = flatMapArray;