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/expo-keep-awake/android/src/main/AndroidManifest.xml

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+<manifest>
+
+</manifest>

smart-app-city/frontend/node_modules/expo-keep-awake/android/src/main/java/expo/modules/keepawake/ExpoKeepAwakeManager.kt

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+package expo.modules.keepawake
+
+import android.app.Activity
+import android.view.WindowManager
+import expo.modules.core.ModuleRegistry
+import expo.modules.core.errors.CurrentActivityNotFoundException
+import expo.modules.core.interfaces.ActivityProvider
+import expo.modules.core.interfaces.InternalModule
+import expo.modules.core.interfaces.services.KeepAwakeManager
+
+class ExpoKeepAwakeManager : KeepAwakeManager, InternalModule {
+  private val tags: MutableSet<String> = HashSet()
+
+  private lateinit var moduleRegistry: ModuleRegistry
+
+  override fun onCreate(moduleRegistry: ModuleRegistry) {
+    this.moduleRegistry = moduleRegistry
+  }
+
+  @get:Throws(CurrentActivityNotFoundException::class)
+  private val currentActivity: Activity
+    get() {
+      val activityProvider = moduleRegistry.getModule(ActivityProvider::class.java)
+        ?: throw CurrentActivityNotFoundException()
+      return if (activityProvider.currentActivity != null) {
+        activityProvider.currentActivity
+      } else {
+        throw CurrentActivityNotFoundException()
+      }
+    }
+
+  @Throws(CurrentActivityNotFoundException::class)
+  override fun activate(tag: String, done: Runnable) {
+    val activity = currentActivity
+    if (!isActivated) {
+      activity.runOnUiThread { activity.window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON) }
+    }
+    tags.add(tag)
+    done.run()
+  }
+
+  @Throws(CurrentActivityNotFoundException::class)
+  override fun deactivate(tag: String, done: Runnable) {
+    val activity = currentActivity
+    if (tags.size == 1 && tags.contains(tag)) {
+      activity.runOnUiThread { activity.window.clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON) }
+    }
+    tags.remove(tag)
+    done.run()
+  }
+
+  override fun isActivated(): Boolean {
+    return tags.isNotEmpty()
+  }
+
+  override fun getExportedInterfaces(): List<Class<*>?> {
+    return listOf(KeepAwakeManager::class.java)
+  }
+}

smart-app-city/frontend/node_modules/expo-keep-awake/android/src/main/java/expo/modules/keepawake/KeepAwakeExceptions.kt

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+package expo.modules.keepawake
+
+import expo.modules.kotlin.exception.CodedException
+
+internal class ActivateKeepAwakeException :
+  CodedException("Unable to activate keep awake")
+
+internal class DeactivateKeepAwakeException :
+  CodedException("Unable to deactivate keep awake. However, it probably is deactivated already")
+
+internal class MissingModuleException(moduleName: String) :
+  CodedException("Module '$moduleName' not found. Are you sure all modules are linked correctly?")

smart-app-city/frontend/node_modules/expo-keep-awake/android/src/main/java/expo/modules/keepawake/KeepAwakeModule.kt

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+// Copyright 2015-present 650 Industries. All rights reserved.
+package expo.modules.keepawake
+
+import expo.modules.core.errors.CurrentActivityNotFoundException
+import expo.modules.core.interfaces.services.KeepAwakeManager
+import expo.modules.kotlin.Promise
+import expo.modules.kotlin.modules.Module
+import expo.modules.kotlin.modules.ModuleDefinition
+
+class KeepAwakeModule : Module() {
+  private val keepAwakeManager: KeepAwakeManager
+    get() = appContext.legacyModule() ?: throw MissingModuleException("KeepAwakeManager")
+
+  override fun definition() = ModuleDefinition {
+    Name("ExpoKeepAwake")
+
+    AsyncFunction("activate") { tag: String, promise: Promise ->
+      try {
+        keepAwakeManager.activate(tag) { promise.resolve(true) }
+      } catch (ex: CurrentActivityNotFoundException) {
+        promise.reject(ActivateKeepAwakeException())
+      }
+    }
+
+    AsyncFunction("deactivate") { tag: String, promise: Promise ->
+      try {
+        keepAwakeManager.deactivate(tag) { promise.resolve(true) }
+      } catch (ex: CurrentActivityNotFoundException) {
+        promise.reject(DeactivateKeepAwakeException())
+      }
+    }
+
+    AsyncFunction<Boolean>("isActivated") {
+      return@AsyncFunction keepAwakeManager.isActivated
+    }
+  }
+}

smart-app-city/frontend/node_modules/expo-keep-awake/android/src/main/java/expo/modules/keepawake/KeepAwakePackage.kt

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+package expo.modules.keepawake
+
+import android.content.Context
+
+import expo.modules.core.interfaces.InternalModule
+import expo.modules.core.interfaces.Package
+
+class KeepAwakePackage : Package {
+  override fun createInternalModules(context: Context): List<InternalModule> {
+    return listOf(ExpoKeepAwakeManager())
+  }
+}