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/ieee754/README.md

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+# ieee754 [![travis][travis-image]][travis-url] [![npm][npm-image]][npm-url] [![downloads][downloads-image]][downloads-url] [![javascript style guide][standard-image]][standard-url]
+
+[travis-image]: https://img.shields.io/travis/feross/ieee754/master.svg
+[travis-url]: https://travis-ci.org/feross/ieee754
+[npm-image]: https://img.shields.io/npm/v/ieee754.svg
+[npm-url]: https://npmjs.org/package/ieee754
+[downloads-image]: https://img.shields.io/npm/dm/ieee754.svg
+[downloads-url]: https://npmjs.org/package/ieee754
+[standard-image]: https://img.shields.io/badge/code_style-standard-brightgreen.svg
+[standard-url]: https://standardjs.com
+
+[![saucelabs][saucelabs-image]][saucelabs-url]
+
+[saucelabs-image]: https://saucelabs.com/browser-matrix/ieee754.svg
+[saucelabs-url]: https://saucelabs.com/u/ieee754
+
+### Read/write IEEE754 floating point numbers from/to a Buffer or array-like object.
+
+## install
+
+```
+npm install ieee754
+```
+
+## methods
+
+`var ieee754 = require('ieee754')`
+
+The `ieee754` object has the following functions:
+
+```
+ieee754.read = function (buffer, offset, isLE, mLen, nBytes)
+ieee754.write = function (buffer, value, offset, isLE, mLen, nBytes)
+```
+
+The arguments mean the following:
+
+- buffer = the buffer
+- offset = offset into the buffer
+- value = value to set (only for `write`)
+- isLe = is little endian?
+- mLen = mantissa length
+- nBytes = number of bytes
+
+## what is ieee754?
+
+The IEEE Standard for Floating-Point Arithmetic (IEEE 754) is a technical standard for floating-point computation. [Read more](http://en.wikipedia.org/wiki/IEEE_floating_point).
+
+## license
+
+BSD 3 Clause. Copyright (c) 2008, Fair Oaks Labs, Inc.