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/react-native/ReactAndroid/external-artifacts/build.gradle.kts

@@ -0,0 +1,68 @@
+/*
+ * 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.
+ */
+
+import org.jetbrains.kotlin.gradle.plugin.extraProperties
+
+plugins { id("maven-publish") }
+
+group = "com.facebook.react"
+
+version =
+    parent?.extraProperties?.get("publishing_version")
+        ?: error("publishing_version not set for external-artifacts")
+
+configurations.maybeCreate("default")
+
+// Those artifacts should be placed inside the `artifacts/hermes-ios-*.tar.gz` location.
+val hermesiOSDebugArtifactFile: RegularFile =
+    layout.projectDirectory.file("artifacts/hermes-ios-debug.tar.gz")
+val hermesiOSDebugArtifact: PublishArtifact =
+    artifacts.add("default", hermesiOSDebugArtifactFile) {
+      type = "tgz"
+      extension = "tar.gz"
+      classifier = "hermes-ios-debug"
+    }
+val hermesiOSReleaseArtifactFile: RegularFile =
+    layout.projectDirectory.file("artifacts/hermes-ios-release.tar.gz")
+val hermesiOSReleaseArtifact: PublishArtifact =
+    artifacts.add("default", hermesiOSReleaseArtifactFile) {
+      type = "tgz"
+      extension = "tar.gz"
+      classifier = "hermes-ios-release"
+    }
+
+// Those artifacts should be placed inside the `artifacts/hermes-*.framework.dSYM` location
+val hermesDSYMDebugArtifactFile: RegularFile =
+    layout.projectDirectory.file("artifacts/hermes-framework-dSYM-debug.tar.gz")
+val hermesDSYMDebugArtifact: PublishArtifact =
+    artifacts.add("default", hermesDSYMDebugArtifactFile) {
+      type = "tgz"
+      extension = "tar.gz"
+      classifier = "hermes-framework-dSYM-debug"
+    }
+val hermesDSYMReleaseArtifactFile: RegularFile =
+    layout.projectDirectory.file("artifacts/hermes-framework-dSYM-release.tar.gz")
+val hermesDSYMReleaseArtifact: PublishArtifact =
+    artifacts.add("default", hermesDSYMReleaseArtifactFile) {
+      type = "tgz"
+      extension = "tar.gz"
+      classifier = "hermes-framework-dSYM-release"
+    }
+
+apply(from = "../publish.gradle")
+
+publishing {
+  publications {
+    getByName("release", MavenPublication::class) {
+      artifactId = "react-native-artifacts"
+      artifact(hermesiOSDebugArtifact)
+      artifact(hermesiOSReleaseArtifact)
+      artifact(hermesDSYMDebugArtifact)
+      artifact(hermesDSYMReleaseArtifact)
+    }
+  }
+}