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/md5/demo/index.html

@@ -0,0 +1,48 @@
+<input type="file" id="input">
+<output id="output"></output>
+<style>
+output::before {
+  content: "output:";
+}
+output {
+  display: block;
+  padding: 1em;
+  margin: 1em;
+  outline: 1px solid gray;
+  white-space: pre-wrap;
+}
+</style>
+<script src="../dist/md5.min.js"></script>
+<script>
+
+
+function readAsArrayBuffer(file){
+  return new Promise(function(resolve) {
+    var reader = new FileReader();
+    reader.readAsArrayBuffer(file)
+    reader.onload = function(e) {
+      resolve(e.target.result)
+    };
+  });
+}
+
+input.onchange = function(e) {
+  var file = input.files[0];
+  readAsArrayBuffer(file)
+  .then(buffer => {
+    console.log(buffer);
+    var now = performance.now();
+    var hash = MD5(buffer);
+    var after = performance.now() - now;
+    output.innerHTML = `
+      file: ${file.name}
+      size: ${file.size} bytes
+      type: ${file.type}
+      md5: ${hash}
+      duration: ${after.toFixed(2)} ms 
+    `;
+  })
+}
+
+
+</script>