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/traverse/examples/json.js

@@ -0,0 +1,18 @@
+'use strict';
+
+var traverse = require('traverse');
+
+var id = 54;
+var callbacks = {};
+var obj = { moo: function () {}, foo: [2, 3, 4, function () {}] };
+
+var scrubbed = traverse(obj).map(function (x) {
+	if (typeof x === 'function') {
+		callbacks[id] = { id: id, f: x, path: this.path };
+		this.update('[Function]');
+		id++;
+	}
+});
+
+console.dir(scrubbed);
+console.dir(callbacks);

smart-app-city/frontend/node_modules/traverse/examples/leaves.js

@@ -0,0 +1,17 @@
+'use strict';
+
+var traverse = require('traverse');
+
+var obj = {
+	a: [1, 2, 3],
+	b: 4,
+	c: [5, 6],
+	d: { e: [7, 8], f: 9 },
+};
+
+var leaves = traverse(obj).reduce(function (acc, x) {
+	if (this.isLeaf) { acc.push(x); }
+	return acc;
+}, []);
+
+console.dir(leaves);

smart-app-city/frontend/node_modules/traverse/examples/negative.js

@@ -0,0 +1,10 @@
+'use strict';
+
+var traverse = require('traverse');
+var obj = [5, 6, -3, [7, 8, -2, 1], { f: 10, g: -13 }];
+
+traverse(obj).forEach(function (x) {
+	if (x < 0) { this.update(x + 128); }
+});
+
+console.dir(obj);

smart-app-city/frontend/node_modules/traverse/examples/scrub.js

@@ -0,0 +1,12 @@
+'use strict';
+
+// scrub out circular references
+var traverse = require('traverse');
+
+var obj = { a: 1, b: 2, c: [3, 4] };
+obj.c.push(obj);
+
+var scrubbed = traverse(obj).map(function () {
+	if (this.circular) { this.remove(); }
+});
+console.dir(scrubbed);

smart-app-city/frontend/node_modules/traverse/examples/stringify.js

@@ -0,0 +1,37 @@
+#!/usr/bin/env node
+
+'use strict';
+
+var traverse = require('traverse');
+
+var obj = ['five', 6, -3, [7, 8, -2, 1], { f: 10, g: -13 }];
+
+var s = '';
+traverse(obj).forEach(function toS(node) {
+	if (Array.isArray(node)) {
+		this.before(function () { s += '['; });
+		this.post(function (child) {
+			if (!child.isLast) { s += ','; }
+		});
+		this.after(function () { s += ']'; });
+	} else if (typeof node === 'object') {
+		this.before(function () { s += '{'; });
+		this.pre(function (x, key) {
+			toS(key);
+			s += ':';
+		});
+		this.post(function (child) {
+			if (!child.isLast) { s += ','; }
+		});
+		this.after(function () { s += '}'; });
+	} else if (typeof node === 'string') {
+		s += '"' + node.toString().replace(/"/g, '\\"') + '"';
+	} else if (typeof node === 'function') {
+		s += 'null';
+	} else {
+		s += node.toString();
+	}
+});
+
+console.log('JSON.stringify: ' + JSON.stringify(obj));
+console.log('this stringify: ' + s);