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/metro-cache-key/package.json

@@ -0,0 +1,24 @@
+{
+  "name": "metro-cache-key",
+  "version": "0.80.12",
+  "description": "🚇 Cache key utility.",
+  "main": "src/index.js",
+  "repository": {
+    "type": "git",
+    "url": "git@github.com:facebook/metro.git"
+  },
+  "scripts": {
+    "prepare-release": "test -d build && rm -rf src.real && mv src src.real && mv build src",
+    "cleanup-release": "test ! -e build && mv src build && mv src.real src"
+  },
+  "license": "MIT",
+  "devDependencies": {
+    "metro-memory-fs": "0.80.12"
+  },
+  "engines": {
+    "node": ">=18"
+  },
+  "dependencies": {
+    "flow-enums-runtime": "^0.0.6"
+  }
+}

smart-app-city/frontend/node_modules/metro-cache-key/src/index.js

@@ -0,0 +1,13 @@
+"use strict";
+
+const crypto = require("crypto");
+const fs = require("fs");
+function getCacheKey(files) {
+  return files
+    .reduce(
+      (hash, file) => hash.update("\0", "utf8").update(fs.readFileSync(file)),
+      crypto.createHash("md5")
+    )
+    .digest("hex");
+}
+module.exports = getCacheKey;

smart-app-city/frontend/node_modules/metro-cache-key/src/index.js.flow

@@ -0,0 +1,26 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict-local
+ * @format
+ * @oncall react_native
+ */
+
+'use strict';
+
+const crypto = require('crypto');
+const fs = require('fs');
+
+function getCacheKey(files: Array<string>): string {
+  return files
+    .reduce(
+      (hash, file) => hash.update('\0', 'utf8').update(fs.readFileSync(file)),
+      crypto.createHash('md5'),
+    )
+    .digest('hex');
+}
+
+module.exports = getCacheKey;