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/dayjs/esm/plugin/minMax/index.d.ts

@@ -0,0 +1,22 @@
+import { PluginFunc } from 'dayjs/esm'
+
+declare const plugin: PluginFunc
+export = plugin
+
+declare module 'dayjs/esm' {
+  export function max(dayjs: [Dayjs, ...Dayjs[]]): Dayjs
+  export function max(noDates: never[]): null
+  export function max(maybeDates: Dayjs[]): Dayjs | null
+
+  export function max(...dayjs: [Dayjs, ...Dayjs[]]): Dayjs
+  export function max(...noDates: never[]): null
+  export function max(...maybeDates: Dayjs[]): Dayjs | null
+
+  export function min(dayjs: [Dayjs, ...Dayjs[]]): Dayjs
+  export function min(noDates: never[]): null
+  export function min(maybeDates: Dayjs[]): Dayjs | null
+
+  export function min(...dayjs: [Dayjs, ...Dayjs[]]): Dayjs
+  export function min(...noDates: never[]): null
+  export function min(...maybeDates: Dayjs[]): Dayjs | null
+}

smart-app-city/frontend/node_modules/dayjs/esm/plugin/minMax/index.js

@@ -0,0 +1,39 @@
+export default (function (o, c, d) {
+  var sortBy = function sortBy(method, dates) {
+    if (!dates || !dates.length || dates.length === 1 && !dates[0] || dates.length === 1 && Array.isArray(dates[0]) && !dates[0].length) {
+      return null;
+    }
+
+    if (dates.length === 1 && dates[0].length > 0) {
+      var _dates = dates;
+      dates = _dates[0];
+    }
+
+    dates = dates.filter(function (date) {
+      return date;
+    });
+    var result;
+    var _dates2 = dates;
+    result = _dates2[0];
+
+    for (var i = 1; i < dates.length; i += 1) {
+      if (!dates[i].isValid() || dates[i][method](result)) {
+        result = dates[i];
+      }
+    }
+
+    return result;
+  };
+
+  d.max = function () {
+    var args = [].slice.call(arguments, 0); // eslint-disable-line prefer-rest-params
+
+    return sortBy('isAfter', args);
+  };
+
+  d.min = function () {
+    var args = [].slice.call(arguments, 0); // eslint-disable-line prefer-rest-params
+
+    return sortBy('isBefore', args);
+  };
+});