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/zustand/umd/index.development.js

@@ -0,0 +1,58 @@
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('zustand/vanilla'), require('react'), require('use-sync-external-store/shim/with-selector')) :
+  typeof define === 'function' && define.amd ? define(['exports', 'zustand/vanilla', 'react', 'use-sync-external-store/shim/with-selector'], factory) :
+  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.zustand = {}, global.zustandVanilla, global.React, global.useSyncExternalStoreShimWithSelector));
+})(this, (function (exports, vanilla, ReactExports, useSyncExternalStoreExports) { 'use strict';
+
+  var useDebugValue = ReactExports.useDebugValue;
+  var useSyncExternalStoreWithSelector = useSyncExternalStoreExports.useSyncExternalStoreWithSelector;
+  var didWarnAboutEqualityFn = false;
+  var identity = function identity(arg) {
+    return arg;
+  };
+  function useStore(api, selector, equalityFn) {
+    if (selector === void 0) {
+      selector = identity;
+    }
+    if (equalityFn && !didWarnAboutEqualityFn) {
+      console.warn("[DEPRECATED] Use `createWithEqualityFn` instead of `create` or use `useStoreWithEqualityFn` instead of `useStore`. They can be imported from 'zustand/traditional'. https://github.com/pmndrs/zustand/discussions/1937");
+      didWarnAboutEqualityFn = true;
+    }
+    var slice = useSyncExternalStoreWithSelector(api.subscribe, api.getState, api.getServerState || api.getInitialState, selector, equalityFn);
+    useDebugValue(slice);
+    return slice;
+  }
+  var createImpl = function createImpl(createState) {
+    if (typeof createState !== 'function') {
+      console.warn("[DEPRECATED] Passing a vanilla store will be unsupported in a future version. Instead use `import { useStore } from 'zustand'`.");
+    }
+    var api = typeof createState === 'function' ? vanilla.createStore(createState) : createState;
+    var useBoundStore = function useBoundStore(selector, equalityFn) {
+      return useStore(api, selector, equalityFn);
+    };
+    Object.assign(useBoundStore, api);
+    return useBoundStore;
+  };
+  var create = function create(createState) {
+    return createState ? createImpl(createState) : createImpl;
+  };
+  var react = (function (createState) {
+    {
+      console.warn("[DEPRECATED] Default export is deprecated. Instead use `import { create } from 'zustand'`.");
+    }
+    return create(createState);
+  });
+
+  exports.create = create;
+  exports.default = react;
+  exports.useStore = useStore;
+  Object.keys(vanilla).forEach(function (k) {
+    if (k !== 'default' && !Object.prototype.hasOwnProperty.call(exports, k)) Object.defineProperty(exports, k, {
+      enumerable: true,
+      get: function () { return vanilla[k]; }
+    });
+  });
+
+  Object.defineProperty(exports, '__esModule', { value: true });
+
+}));