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/md5hex/.npmignore

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+# Logs
+logs
+*.log
+
+# Runtime data
+pids
+*.pid
+*.seed
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directory
+# https://www.npmjs.org/doc/misc/npm-faq.html#should-i-check-my-node_modules-folder-into-git
+node_modules

smart-app-city/frontend/node_modules/md5hex/LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2015 650 Industries
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+

smart-app-city/frontend/node_modules/md5hex/README.md

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+# md5hex
+Thin wrapper around the crypto module that creates an MD5 hex digest of a given string or buffer
+
+```js
+// Basic usage
+var hexHash = md5hex('A string you want to hash'); // (You can also pass in a buffer)
+// 'afb6e4ac5196aa6cddcfbd8fe26cf65b'
+
+
+// Optional second argument lets you trim the length
+var hexHash = md5hex('A string you want to hash', 6);
+// 'afb6e4'
+
+// Or you can give an options object as the second argument to add a salt
+var hexHash = md5hex('A string you want to prefix with a salt', {salt: 'MYSALT!'})
+// Same as md5hex('MYSALT!' + 'A string you want to prefix with a salt')
+
+var hexHash = md5hex('A string you want to prefix with a salt', {saltPrefix: 'SALT!', saltSuffix: 'MORESALT!'})
+// Same as md5hex('SALT!' + 'A string you want to prefix with a salt' + 'MORESALT!')
+
+// And control the length through the options object
+var hexHash = md5hex('A string you want a short hash of', {length: 6});
+// '30540f'
+
+
+
+```

smart-app-city/frontend/node_modules/md5hex/index.js

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+var crypto = require('crypto');
+
+module.exports = function (stringOrBuffer, opts) {
+  var md5sum = crypto.createHash('md5');
+
+  if (typeof(opts) == 'number') {
+    opts = {length: opts};
+  }
+  opts = opts || {};
+
+  if (opts.salt) {
+    md5sum.update(opts.salt);
+  }
+
+  if (opts.saltPrefix) {
+    md5sum.update(opts.saltPrefix);
+  }
+
+  md5sum.update(stringOrBuffer);
+
+  if (opts.saltSuffix) {
+    md5sum.update(opts.saltSuffix);
+  }
+
+  var digest = md5sum.digest('hex');
+
+  if (opts.length == null) {
+    return digest;
+  } else {
+    return digest.substr(0, opts.length);
+  }
+
+};

smart-app-city/frontend/node_modules/md5hex/package.json

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+{
+  "name": "md5hex",
+  "version": "1.0.0",
+  "description": "Thin wrapper around the crypto module that creates an MD5 hex digest of a given string or buffer",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/650Industries/md5hex.git"
+  },
+  "keywords": [
+    "md5hex",
+    "md5",
+    "hex",
+    "hash",
+    "crypto"
+  ],
+  "author": "exponent.team@gmail.com",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/650Industries/md5hex/issues"
+  },
+  "homepage": "https://github.com/650Industries/md5hex#readme"
+}