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-image-loader/android/src/main/AndroidManifest.xml

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+<manifest>
+</manifest>

smart-app-city/frontend/node_modules/expo-image-loader/android/src/main/java/expo/modules/imageloader/ImageLoaderModule.kt

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+package expo.modules.imageloader
+
+import android.content.Context
+import android.graphics.Bitmap
+import android.graphics.drawable.Drawable
+import com.bumptech.glide.Glide
+import com.bumptech.glide.load.engine.DiskCacheStrategy
+import com.bumptech.glide.request.target.CustomTarget
+import com.bumptech.glide.request.transition.Transition
+import expo.modules.core.interfaces.InternalModule
+import expo.modules.interfaces.imageloader.ImageLoaderInterface
+import java.util.concurrent.ExecutionException
+import java.util.concurrent.Future
+
+class ImageLoaderModule(val context: Context) : InternalModule, ImageLoaderInterface {
+
+  override fun getExportedInterfaces(): List<Class<*>> {
+    return listOf(ImageLoaderInterface::class.java)
+  }
+
+  override fun loadImageForDisplayFromURL(url: String): Future<Bitmap> {
+    val future = SimpleSettableFuture<Bitmap>()
+    loadImageForDisplayFromURL(
+      url,
+      object : ImageLoaderInterface.ResultListener {
+        override fun onSuccess(bitmap: Bitmap) = future.set(bitmap)
+
+        override fun onFailure(cause: Throwable?) =
+          future.setException(ExecutionException(cause))
+      }
+    )
+    return future
+  }
+
+  override fun loadImageForDisplayFromURL(
+    url: String,
+    resultListener: ImageLoaderInterface.ResultListener
+  ) {
+    Glide.with(context)
+      .asBitmap()
+      .load(url)
+      .into(object : CustomTarget<Bitmap>() {
+        override fun onResourceReady(resource: Bitmap, transition: Transition<in Bitmap>?) {
+          resultListener.onSuccess(resource)
+        }
+
+        override fun onLoadCleared(placeholder: Drawable?) {
+          // no op
+        }
+
+        override fun onLoadFailed(errorDrawable: Drawable?) {
+          super.onLoadFailed(errorDrawable)
+          resultListener.onFailure(Exception("Loading bitmap failed"))
+        }
+      })
+  }
+
+  override fun loadImageForManipulationFromURL(url: String): Future<Bitmap> {
+    val future = SimpleSettableFuture<Bitmap>()
+    loadImageForManipulationFromURL(
+      url,
+      object : ImageLoaderInterface.ResultListener {
+        override fun onSuccess(bitmap: Bitmap) = future.set(bitmap)
+
+        override fun onFailure(cause: Throwable?) = future.setException(ExecutionException(cause))
+      }
+    )
+    return future
+  }
+
+  override fun loadImageForManipulationFromURL(
+    url: String,
+    resultListener: ImageLoaderInterface.ResultListener
+  ) {
+    val normalizedUrl = normalizeAssetsUrl(url)
+
+    Glide.with(context)
+      .asBitmap()
+      .diskCacheStrategy(DiskCacheStrategy.NONE)
+      .skipMemoryCache(true)
+      .load(normalizedUrl)
+      .into(object : CustomTarget<Bitmap>() {
+        override fun onResourceReady(resource: Bitmap, transition: Transition<in Bitmap>?) {
+          resultListener.onSuccess(resource)
+        }
+
+        override fun onLoadCleared(placeholder: Drawable?) {
+          // no op
+        }
+
+        override fun onLoadFailed(errorDrawable: Drawable?) {
+          super.onLoadFailed(errorDrawable)
+          resultListener.onFailure(Exception("Loading bitmap failed"))
+        }
+      })
+  }
+
+  private fun normalizeAssetsUrl(url: String): String {
+    var actualUrl = url
+    if (url.startsWith("asset:///")) {
+      actualUrl = "file:///android_asset/" + url.split("/").last()
+    }
+    return actualUrl
+  }
+}

smart-app-city/frontend/node_modules/expo-image-loader/android/src/main/java/expo/modules/imageloader/ImageLoaderPackage.kt

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+package expo.modules.imageloader
+
+import android.content.Context
+import expo.modules.core.BasePackage
+import expo.modules.core.interfaces.InternalModule
+
+class ImageLoaderPackage : BasePackage() {
+  override fun createInternalModules(context: Context): List<InternalModule> = listOf(ImageLoaderModule(context))
+}

smart-app-city/frontend/node_modules/expo-image-loader/android/src/main/java/expo/modules/imageloader/SimpleSettableFuture.java

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+// Copied from React Native
+package expo.modules.imageloader;
+
+import androidx.annotation.Nullable;
+
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+/**
+ * A super simple Future-like class that can safely notify another Thread when a value is ready.
+ * Does not support canceling.
+ */
+public class SimpleSettableFuture<T> implements Future<T> {
+  private final CountDownLatch mReadyLatch = new CountDownLatch(1);
+  private @Nullable
+  T mResult;
+  private @Nullable
+  Exception mException;
+
+  /**
+   * Sets the result. If another thread has called {@link #get}, they will immediately receive the
+   * value. set or setException must only be called once.
+   */
+  public void set(@Nullable T result) {
+    checkNotSet();
+    mResult = result;
+    mReadyLatch.countDown();
+  }
+
+  /**
+   * Sets the exception. If another thread has called {@link #get}, they will immediately receive
+   * the exception. set or setException must only be called once.
+   */
+  public void setException(Exception exception) {
+    checkNotSet();
+    mException = exception;
+    mReadyLatch.countDown();
+  }
+
+  @Override
+  public boolean cancel(boolean mayInterruptIfRunning) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public boolean isCancelled() {
+    return false;
+  }
+
+  @Override
+  public boolean isDone() {
+    return mReadyLatch.getCount() == 0;
+  }
+
+  @Override
+  public @Nullable
+  T get() throws InterruptedException, ExecutionException {
+    mReadyLatch.await();
+    if (mException != null) {
+      throw new ExecutionException(mException);
+    }
+
+    return mResult;
+  }
+
+  /**
+   * Wait up to the timeout time for another Thread to set a value on this future. If a value has
+   * already been set, this method will return immediately.
+   *
+   * <p>NB: For simplicity, we catch and wrap InterruptedException. Do NOT use this class if you are
+   * in the 1% of cases where you actually want to handle that.
+   */
+  @Override
+  public @Nullable
+  T get(long timeout, TimeUnit unit)
+    throws InterruptedException, ExecutionException, TimeoutException {
+    if (!mReadyLatch.await(timeout, unit)) {
+      throw new TimeoutException("Timed out waiting for result");
+    }
+    if (mException != null) {
+      throw new ExecutionException(mException);
+    }
+
+    return mResult;
+  }
+
+  /**
+   * Convenience wrapper for {@link #get()} that re-throws get()'s Exceptions as RuntimeExceptions.
+   */
+  public @Nullable
+  T getOrThrow() {
+    try {
+      return get();
+    } catch (InterruptedException | ExecutionException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  /**
+   * Convenience wrapper for {@link #get(long, TimeUnit)} that re-throws get()'s Exceptions as
+   * RuntimeExceptions.
+   */
+  public @Nullable
+  T getOrThrow(long timeout, TimeUnit unit) {
+    try {
+      return get(timeout, unit);
+    } catch (InterruptedException | ExecutionException | TimeoutException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  private void checkNotSet() {
+    if (mReadyLatch.getCount() == 0) {
+      throw new RuntimeException("Result has already been set!");
+    }
+  }
+}