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/locate-path/readme.md

@@ -0,0 +1,125 @@
+# locate-path [![Build Status](https://travis-ci.com/sindresorhus/locate-path.svg?branch=master)](https://travis-ci.com/github/sindresorhus/locate-path)
+
+> Get the first path that exists on disk of multiple paths
+
+## Install
+
+```
+$ npm install locate-path
+```
+
+## Usage
+
+Here we find the first file that exists on disk, in array order.
+
+```js
+const locatePath = require('locate-path');
+
+const files = [
+	'unicorn.png',
+	'rainbow.png', // Only this one actually exists on disk
+	'pony.png'
+];
+
+(async () => {
+	console(await locatePath(files));
+	//=> 'rainbow'
+})();
+```
+
+## API
+
+### locatePath(paths, options?)
+
+Returns a `Promise<string>` for the first path that exists or `undefined` if none exists.
+
+#### paths
+
+Type: `Iterable<string>`
+
+Paths to check.
+
+#### options
+
+Type: `object`
+
+##### concurrency
+
+Type: `number`\
+Default: `Infinity`\
+Minimum: `1`
+
+Number of concurrently pending promises.
+
+##### preserveOrder
+
+Type: `boolean`\
+Default: `true`
+
+Preserve `paths` order when searching.
+
+Disable this to improve performance if you don't care about the order.
+
+##### cwd
+
+Type: `string`\
+Default: `process.cwd()`
+
+Current working directory.
+
+##### type
+
+Type: `string`\
+Default: `'file'`\
+Values: `'file' | 'directory'`
+
+The type of paths that can match.
+
+##### allowSymlinks
+
+Type: `boolean`\
+Default: `true`
+
+Allow symbolic links to match if they point to the chosen path type.
+
+### locatePath.sync(paths, options?)
+
+Returns the first path that exists or `undefined` if none exists.
+
+#### paths
+
+Type: `Iterable<string>`
+
+Paths to check.
+
+#### options
+
+Type: `object`
+
+##### cwd
+
+Same as above.
+
+##### type
+
+Same as above.
+
+##### allowSymlinks
+
+Same as above.
+
+## Related
+
+- [path-exists](https://github.com/sindresorhus/path-exists) - Check if a path exists
+
+---
+
+<div align="center">
+	<b>
+		<a href="https://tidelift.com/subscription/pkg/npm-locate-path?utm_source=npm-locate-path&utm_medium=referral&utm_campaign=readme">Get professional support for this package with a Tidelift subscription</a>
+	</b>
+	<br>
+	<sub>
+		Tidelift helps make open source sustainable for maintainers while giving companies<br>assurances about security, maintenance, and licensing for their dependencies.
+	</sub>
+</div>