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/serialize-error/index.js

@@ -0,0 +1,63 @@
+'use strict';
+
+// Make a value ready for JSON.stringify() / process.send()
+module.exports = function (value) {
+	if (typeof value === 'object') {
+		return destroyCircular(value, []);
+	}
+
+	// People sometimes throw things besides Error objects, so...
+
+	if (typeof value === 'function') {
+		// JSON.stringify discards functions. We do to, unless a function is thrown directly.
+		return '[Function: ' + (value.name || 'anonymous') + ']';
+	}
+
+	return value;
+};
+
+// https://www.npmjs.com/package/destroy-circular
+function destroyCircular(from, seen) {
+	var to;
+	if (Array.isArray(from)) {
+		to = [];
+	} else {
+		to = {};
+	}
+
+	seen.push(from);
+
+	Object.keys(from).forEach(function (key) {
+		var value = from[key];
+
+		if (typeof value === 'function') {
+			return;
+		}
+
+		if (!value || typeof value !== 'object') {
+			to[key] = value;
+			return;
+		}
+
+		if (seen.indexOf(from[key]) === -1) {
+			to[key] = destroyCircular(from[key], seen.slice(0));
+			return;
+		}
+
+		to[key] = '[Circular]';
+	});
+
+	if (typeof from.name === 'string') {
+		to.name = from.name;
+	}
+
+	if (typeof from.message === 'string') {
+		to.message = from.message;
+	}
+
+	if (typeof from.stack === 'string') {
+		to.stack = from.stack;
+	}
+
+	return to;
+}

smart-app-city/frontend/node_modules/serialize-error/license

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)
+
+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/serialize-error/package.json

@@ -0,0 +1,36 @@
+{
+  "name": "serialize-error",
+  "version": "2.1.0",
+  "description": "Serialize an error into a plain object",
+  "license": "MIT",
+  "repository": "sindresorhus/serialize-error",
+  "author": {
+    "name": "Sindre Sorhus",
+    "email": "sindresorhus@gmail.com",
+    "url": "sindresorhus.com"
+  },
+  "engines": {
+    "node": ">=0.10.0"
+  },
+  "scripts": {
+    "test": "xo && ava"
+  },
+  "files": [
+    "index.js"
+  ],
+  "keywords": [
+    "error",
+    "err",
+    "serialize",
+    "stringify",
+    "object",
+    "obj",
+    "convert",
+    "process",
+    "send"
+  ],
+  "devDependencies": {
+    "ava": "*",
+    "xo": "^0.16.0"
+  }
+}

smart-app-city/frontend/node_modules/serialize-error/readme.md

@@ -0,0 +1,31 @@
+# serialize-error [![Build Status](https://travis-ci.org/sindresorhus/serialize-error.svg?branch=master)](https://travis-ci.org/sindresorhus/serialize-error)
+
+> Serialize an error into a plain object
+
+Useful if you for example need to `JSON.stringify()` or `process.send()` the error.
+
+
+## Install
+
+```
+$ npm install --save serialize-error
+```
+
+
+## Usage
+
+```js
+const serializeError = require('serialize-error');
+const error = new Error('unicorn');
+
+console.log(error);
+//=> [Error: unicorn]
+
+console.log(serializeError(error));
+//=> {name: 'Error', message: 'unicorn', stack: 'Error: unicorn\n    at Object.<anonymous> ...'}
+```
+
+
+## License
+
+MIT © [Sindre Sorhus](https://sindresorhus.com)