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/graphql/validation/rules/NoUndefinedVariablesRule.mjs

@@ -0,0 +1,34 @@
+import { GraphQLError } from "../../error/GraphQLError.mjs";
+
+/**
+ * No undefined variables
+ *
+ * A GraphQL operation is only valid if all variables encountered, both directly
+ * and via fragment spreads, are defined by that operation.
+ */
+export function NoUndefinedVariablesRule(context) {
+  var variableNameDefined = Object.create(null);
+  return {
+    OperationDefinition: {
+      enter: function enter() {
+        variableNameDefined = Object.create(null);
+      },
+      leave: function leave(operation) {
+        var usages = context.getRecursiveVariableUsages(operation);
+
+        for (var _i2 = 0; _i2 < usages.length; _i2++) {
+          var _ref2 = usages[_i2];
+          var node = _ref2.node;
+          var varName = node.name.value;
+
+          if (variableNameDefined[varName] !== true) {
+            context.reportError(new GraphQLError(operation.name ? "Variable \"$".concat(varName, "\" is not defined by operation \"").concat(operation.name.value, "\".") : "Variable \"$".concat(varName, "\" is not defined."), [node, operation]));
+          }
+        }
+      }
+    },
+    VariableDefinition: function VariableDefinition(node) {
+      variableNameDefined[node.variable.name.value] = true;
+    }
+  };
+}