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/merge.js

@@ -0,0 +1,71 @@
+'use strict';
+
+var identity = require('../../nodes/identity.js');
+var Scalar = require('../../nodes/Scalar.js');
+
+// If the value associated with a merge key is a single mapping node, each of
+// its key/value pairs is inserted into the current mapping, unless the key
+// already exists in it. If the value associated with the merge key is a
+// sequence, then this sequence is expected to contain mapping nodes and each
+// of these nodes is merged in turn according to its order in the sequence.
+// Keys in mapping nodes earlier in the sequence override keys specified in
+// later mapping nodes. -- http://yaml.org/type/merge.html
+const MERGE_KEY = '<<';
+const merge = {
+    identify: value => value === MERGE_KEY ||
+        (typeof value === 'symbol' && value.description === MERGE_KEY),
+    default: 'key',
+    tag: 'tag:yaml.org,2002:merge',
+    test: /^<<$/,
+    resolve: () => Object.assign(new Scalar.Scalar(Symbol(MERGE_KEY)), {
+        addToJSMap: addMergeToJSMap
+    }),
+    stringify: () => MERGE_KEY
+};
+const isMergeKey = (ctx, key) => (merge.identify(key) ||
+    (identity.isScalar(key) &&
+        (!key.type || key.type === Scalar.Scalar.PLAIN) &&
+        merge.identify(key.value))) &&
+    ctx?.doc.schema.tags.some(tag => tag.tag === merge.tag && tag.default);
+function addMergeToJSMap(ctx, map, value) {
+    const source = resolveAliasValue(ctx, value);
+    if (identity.isSeq(source))
+        for (const it of source.items)
+            mergeValue(ctx, map, it);
+    else if (Array.isArray(source))
+        for (const it of source)
+            mergeValue(ctx, map, it);
+    else
+        mergeValue(ctx, map, source);
+}
+function mergeValue(ctx, map, value) {
+    const source = resolveAliasValue(ctx, value);
+    if (!identity.isMap(source))
+        throw new Error('Merge sources must be maps or map aliases');
+    const srcMap = source.toJSON(null, ctx, Map);
+    for (const [key, value] of srcMap) {
+        if (map instanceof Map) {
+            if (!map.has(key))
+                map.set(key, value);
+        }
+        else if (map instanceof Set) {
+            map.add(key);
+        }
+        else if (!Object.prototype.hasOwnProperty.call(map, key)) {
+            Object.defineProperty(map, key, {
+                value,
+                writable: true,
+                enumerable: true,
+                configurable: true
+            });
+        }
+    }
+    return map;
+}
+function resolveAliasValue(ctx, value) {
+    return ctx && identity.isAlias(value) ? value.resolve(ctx.doc, ctx) : value;
+}
+
+exports.addMergeToJSMap = addMergeToJSMap;
+exports.isMergeKey = isMergeKey;
+exports.merge = merge;