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/react-native/Libraries/Linking/Linking.d.ts

@@ -0,0 +1,61 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+import {NativeEventEmitter} from '../EventEmitter/NativeEventEmitter';
+import {EmitterSubscription} from '../vendor/emitter/EventEmitter';
+
+export interface LinkingStatic extends NativeEventEmitter {
+  /**
+   * Add a handler to Linking changes by listening to the `url` event type
+   * and providing the handler
+   */
+  addEventListener(
+    type: 'url',
+    handler: (event: {url: string}) => void,
+  ): EmitterSubscription;
+
+  /**
+   * Try to open the given url with any of the installed apps.
+   * You can use other URLs, like a location (e.g. "geo:37.484847,-122.148386"), a contact, or any other URL that can be opened with the installed apps.
+   * NOTE: This method will fail if the system doesn't know how to open the specified URL. If you're passing in a non-http(s) URL, it's best to check {@code canOpenURL} first.
+   * NOTE: For web URLs, the protocol ("http://", "https://") must be set accordingly!
+   */
+  openURL(url: string): Promise<any>;
+
+  /**
+   * Determine whether or not an installed app can handle a given URL.
+   * NOTE: For web URLs, the protocol ("http://", "https://") must be set accordingly!
+   * NOTE: As of iOS 9, your app needs to provide the LSApplicationQueriesSchemes key inside Info.plist.
+   * @param URL the URL to open
+   */
+  canOpenURL(url: string): Promise<boolean>;
+
+  /**
+   * If the app launch was triggered by an app link with, it will give the link url, otherwise it will give null
+   * NOTE: To support deep linking on Android, refer http://developer.android.com/training/app-indexing/deep-linking.html#handling-intents
+   */
+  getInitialURL(): Promise<string | null>;
+
+  /**
+   * Open the Settings app and displays the app’s custom settings, if it has any.
+   */
+  openSettings(): Promise<void>;
+
+  /**
+   * Sends an Android Intent - a broad surface to express Android functions.  Useful for deep-linking to settings pages,
+   * opening an SMS app with a message draft in place, and more.  See https://developer.android.com/reference/kotlin/android/content/Intent?hl=en
+   */
+  sendIntent(
+    action: string,
+    extras?: Array<{key: string; value: string | number | boolean}>,
+  ): Promise<void>;
+}
+
+export const Linking: LinkingStatic;
+export type Linking = LinkingStatic;