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/@nodelib/fs.stat/out/adapters/fs.d.ts

@@ -0,0 +1,13 @@
+/// <reference types="node" />
+import * as fs from 'fs';
+import type { ErrnoException } from '../types';
+export declare type StatAsynchronousMethod = (path: string, callback: (error: ErrnoException | null, stats: fs.Stats) => void) => void;
+export declare type StatSynchronousMethod = (path: string) => fs.Stats;
+export interface FileSystemAdapter {
+    lstat: StatAsynchronousMethod;
+    stat: StatAsynchronousMethod;
+    lstatSync: StatSynchronousMethod;
+    statSync: StatSynchronousMethod;
+}
+export declare const FILE_SYSTEM_ADAPTER: FileSystemAdapter;
+export declare function createFileSystemAdapter(fsMethods?: Partial<FileSystemAdapter>): FileSystemAdapter;

smart-app-city/frontend/node_modules/@nodelib/fs.stat/out/adapters/fs.js

@@ -0,0 +1,17 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.createFileSystemAdapter = exports.FILE_SYSTEM_ADAPTER = void 0;
+const fs = require("fs");
+exports.FILE_SYSTEM_ADAPTER = {
+    lstat: fs.lstat,
+    stat: fs.stat,
+    lstatSync: fs.lstatSync,
+    statSync: fs.statSync
+};
+function createFileSystemAdapter(fsMethods) {
+    if (fsMethods === undefined) {
+        return exports.FILE_SYSTEM_ADAPTER;
+    }
+    return Object.assign(Object.assign({}, exports.FILE_SYSTEM_ADAPTER), fsMethods);
+}
+exports.createFileSystemAdapter = createFileSystemAdapter;