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/expo-keep-awake/src/ExpoKeepAwake.ts

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+import { requireNativeModule } from 'expo-modules-core';
+export default requireNativeModule('ExpoKeepAwake');

smart-app-city/frontend/node_modules/expo-keep-awake/src/ExpoKeepAwake.web.ts

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+import { CodedError, Platform, Subscription } from 'expo-modules-core';
+
+import { KeepAwakeEventState, KeepAwakeListener } from './KeepAwake.types';
+
+const wakeLockMap: Record<string, WakeLockSentinel> = {};
+
+type WakeLockSentinel = {
+  onrelease: null | ((event: any) => void);
+  released: boolean;
+  type: 'screen';
+  release?: Function;
+
+  addEventListener?: (event: string, listener: (event: any) => void) => void;
+  removeEventListener?: (event: string, listener: (event: any) => void) => void;
+};
+
+declare const navigator: {
+  wakeLock: {
+    request(type: 'screen'): Promise<WakeLockSentinel>;
+  };
+};
+
+/** Wraps the webWakeLock API https://developer.mozilla.org/en-US/docs/Web/API/Screen_Wake_Lock_API */
+export default {
+  async isAvailableAsync() {
+    if (Platform.isDOMAvailable) {
+      return 'wakeLock' in navigator;
+    }
+    return false;
+  },
+  async activate(tag: string) {
+    if (!Platform.isDOMAvailable) {
+      return;
+    }
+    const wakeLock = await navigator.wakeLock.request('screen');
+    wakeLockMap[tag] = wakeLock;
+  },
+  async deactivate(tag: string) {
+    if (!Platform.isDOMAvailable) {
+      return;
+    }
+    if (wakeLockMap[tag]) {
+      wakeLockMap[tag].release?.();
+      delete wakeLockMap[tag];
+    } else {
+      throw new CodedError(
+        'ERR_KEEP_AWAKE_TAG_INVALID',
+        `The wake lock with tag ${tag} has not activated yet`
+      );
+    }
+  },
+  addListenerForTag(tag: string, listener: KeepAwakeListener): Subscription {
+    const eventListener = () => {
+      listener({ state: KeepAwakeEventState.RELEASE });
+    };
+    const sentinel = wakeLockMap[tag];
+    if (sentinel) {
+      if ('addEventListener' in sentinel) {
+        sentinel.addEventListener?.('release', eventListener);
+      } else {
+        sentinel.onrelease = eventListener;
+      }
+    }
+    return {
+      remove: () => {
+        const sentinel = wakeLockMap[tag];
+        if (sentinel) {
+          if (sentinel.removeEventListener) {
+            sentinel.removeEventListener('release', eventListener);
+          } else {
+            sentinel.onrelease = null;
+          }
+        }
+      },
+    };
+  },
+};

smart-app-city/frontend/node_modules/expo-keep-awake/src/KeepAwake.types.ts

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+// @needsAudit
+export type KeepAwakeEvent = {
+  /** Keep awake state. */
+  state: KeepAwakeEventState;
+};
+
+// @needsAudit
+export enum KeepAwakeEventState {
+  RELEASE = 'release',
+}
+
+// @needsAudit
+export type KeepAwakeListener = (event: KeepAwakeEvent) => void;
+
+export type KeepAwakeOptions = {
+  /**
+   * The call will throw an unhandled promise rejection on Android when the original Activity is dead or deactivated.
+   * Set the value to `true` for suppressing the uncaught exception.
+   */
+  suppressDeactivateWarnings?: boolean;
+
+  /**
+   * A callback that is invoked when the keep-awake state changes.
+   * @platform web
+   */
+  listener?: KeepAwakeListener;
+};

smart-app-city/frontend/node_modules/expo-keep-awake/src/index.ts

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+import { Subscription, UnavailabilityError } from 'expo-modules-core';
+import { useEffect, useId } from 'react';
+
+import ExpoKeepAwake from './ExpoKeepAwake';
+import { KeepAwakeListener, KeepAwakeOptions } from './KeepAwake.types';
+
+/** Default tag, used when no tag has been specified in keep awake method calls. */
+export const ExpoKeepAwakeTag = 'ExpoKeepAwakeDefaultTag';
+
+/** @returns `true` on all platforms except [unsupported web browsers](https://caniuse.com/wake-lock). */
+export async function isAvailableAsync(): Promise<boolean> {
+  if (ExpoKeepAwake.isAvailableAsync) {
+    return await ExpoKeepAwake.isAvailableAsync();
+  }
+  return true;
+}
+
+/**
+ * A React hook to keep the screen awake for as long as the owner component is mounted.
+ * The optionally provided `tag` argument is used when activating and deactivating the keep-awake
+ * feature. If unspecified, an ID unique to the owner component is used. See the documentation for
+ * `activateKeepAwakeAsync` below to learn more about the `tag` argument.
+ *
+ * @param tag Tag to lock screen sleep prevention. If not provided, an ID unique to the owner component is used.
+ * @param options Additional options for the keep awake hook.
+ */
+export function useKeepAwake(tag?: string, options?: KeepAwakeOptions): void {
+  const defaultTag = useId();
+  const tagOrDefault = tag ?? defaultTag;
+
+  useEffect(() => {
+    let isMounted = true;
+    activateKeepAwakeAsync(tagOrDefault).then(() => {
+      if (isMounted && ExpoKeepAwake.addListenerForTag && options?.listener) {
+        addListener(tagOrDefault, options.listener);
+      }
+    });
+    return () => {
+      isMounted = false;
+      if (options?.suppressDeactivateWarnings) {
+        deactivateKeepAwake(tagOrDefault).catch(() => {});
+      } else {
+        deactivateKeepAwake(tagOrDefault);
+      }
+    };
+  }, [tagOrDefault]);
+}
+
+// @needsAudit
+/**
+ * Prevents the screen from sleeping until `deactivateKeepAwake` is called with the same `tag` value.
+ *
+ * If the `tag` argument is specified, the screen will not sleep until you call `deactivateKeepAwake`
+ * with the same `tag` argument. When using multiple `tags` for activation you'll have to deactivate
+ * each one in order to re-enable screen sleep. If tag is unspecified, the default `tag` is used.
+ *
+ * Web support [is limited](https://caniuse.com/wake-lock).
+ *
+ * @param tag Tag to lock screen sleep prevention. If not provided, the default tag is used.
+ * @deprecated use `activateKeepAwakeAsync` instead.
+ */
+export function activateKeepAwake(tag: string = ExpoKeepAwakeTag): Promise<void> {
+  console.warn('`activateKeepAwake` is deprecated. Use `activateKeepAwakeAsync` instead.');
+  return activateKeepAwakeAsync(tag);
+}
+
+// @needsAudit
+/**
+ * Prevents the screen from sleeping until `deactivateKeepAwake` is called with the same `tag` value.
+ *
+ * If the `tag` argument is specified, the screen will not sleep until you call `deactivateKeepAwake`
+ * with the same `tag` argument. When using multiple `tags` for activation you'll have to deactivate
+ * each one in order to re-enable screen sleep. If tag is unspecified, the default `tag` is used.
+ *
+ * Web support [is limited](https://caniuse.com/wake-lock).
+ *
+ * @param tag Tag to lock screen sleep prevention. If not provided, the default tag is used.
+ */
+export async function activateKeepAwakeAsync(tag: string = ExpoKeepAwakeTag): Promise<void> {
+  await ExpoKeepAwake.activate?.(tag);
+}
+
+// @needsAudit
+/**
+ * Releases the lock on screen-sleep prevention associated with the given `tag` value. If `tag`
+ * is unspecified, it defaults to the same default tag that `activateKeepAwake` uses.
+ *
+ * @param tag Tag to release the lock on screen sleep prevention. If not provided,
+ * the default tag is used.
+ */
+export async function deactivateKeepAwake(tag: string = ExpoKeepAwakeTag): Promise<void> {
+  await ExpoKeepAwake.deactivate?.(tag);
+}
+
+/**
+ * Observe changes to the keep awake timer.
+ * On web, this changes when navigating away from the active window/tab. No-op on native.
+ * @platform web
+ *
+ * @example
+ * ```ts
+ * KeepAwake.addListener(({ state }) => {
+ *   // ...
+ * });
+ * ```
+ */
+export function addListener(
+  tagOrListener: string | KeepAwakeListener,
+  listener?: KeepAwakeListener
+): Subscription {
+  // Assert so the type is non-nullable.
+  if (!ExpoKeepAwake.addListenerForTag) {
+    throw new UnavailabilityError('ExpoKeepAwake', 'addListenerForTag');
+  }
+
+  const tag = typeof tagOrListener === 'string' ? tagOrListener : ExpoKeepAwakeTag;
+  const _listener = typeof tagOrListener === 'function' ? tagOrListener : listener;
+
+  return ExpoKeepAwake.addListenerForTag(tag, _listener);
+}
+
+export * from './KeepAwake.types';