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/yaml/dist/schema/yaml-1.1/binary.js

@@ -0,0 +1,70 @@
+'use strict';
+
+var node_buffer = require('buffer');
+var Scalar = require('../../nodes/Scalar.js');
+var stringifyString = require('../../stringify/stringifyString.js');
+
+const binary = {
+    identify: value => value instanceof Uint8Array, // Buffer inherits from Uint8Array
+    default: false,
+    tag: 'tag:yaml.org,2002:binary',
+    /**
+     * Returns a Buffer in node and an Uint8Array in browsers
+     *
+     * To use the resulting buffer as an image, you'll want to do something like:
+     *
+     *   const blob = new Blob([buffer], { type: 'image/jpeg' })
+     *   document.querySelector('#photo').src = URL.createObjectURL(blob)
+     */
+    resolve(src, onError) {
+        if (typeof node_buffer.Buffer === 'function') {
+            return node_buffer.Buffer.from(src, 'base64');
+        }
+        else if (typeof atob === 'function') {
+            // On IE 11, atob() can't handle newlines
+            const str = atob(src.replace(/[\n\r]/g, ''));
+            const buffer = new Uint8Array(str.length);
+            for (let i = 0; i < str.length; ++i)
+                buffer[i] = str.charCodeAt(i);
+            return buffer;
+        }
+        else {
+            onError('This environment does not support reading binary tags; either Buffer or atob is required');
+            return src;
+        }
+    },
+    stringify({ comment, type, value }, ctx, onComment, onChompKeep) {
+        if (!value)
+            return '';
+        const buf = value; // checked earlier by binary.identify()
+        let str;
+        if (typeof node_buffer.Buffer === 'function') {
+            str =
+                buf instanceof node_buffer.Buffer
+                    ? buf.toString('base64')
+                    : node_buffer.Buffer.from(buf.buffer).toString('base64');
+        }
+        else if (typeof btoa === 'function') {
+            let s = '';
+            for (let i = 0; i < buf.length; ++i)
+                s += String.fromCharCode(buf[i]);
+            str = btoa(s);
+        }
+        else {
+            throw new Error('This environment does not support writing binary tags; either Buffer or btoa is required');
+        }
+        type ?? (type = Scalar.Scalar.BLOCK_LITERAL);
+        if (type !== Scalar.Scalar.QUOTE_DOUBLE) {
+            const lineWidth = Math.max(ctx.options.lineWidth - ctx.indent.length, ctx.options.minContentWidth);
+            const n = Math.ceil(str.length / lineWidth);
+            const lines = new Array(n);
+            for (let i = 0, o = 0; i < n; ++i, o += lineWidth) {
+                lines[i] = str.substr(o, lineWidth);
+            }
+            str = lines.join(type === Scalar.Scalar.BLOCK_LITERAL ? '\n' : ' ');
+        }
+        return stringifyString.stringifyString({ comment, type, value: str }, ctx, onComment, onChompKeep);
+    }
+};
+
+exports.binary = binary;