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/Libraries/Image/RCTImageCache.h

@@ -0,0 +1,45 @@
+/*
+ * 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 <Foundation/Foundation.h>
+#import <UIKit/UIKit.h>
+
+#import <React/RCTResizeMode.h>
+
+@interface UIImage (React)
+
+/**
+ * Memory bytes of the image with the default calculation of static image or GIF. Custom calculations of decoded bytes
+ * can be assigned manually.
+ */
+@property (nonatomic, assign) NSInteger reactDecodedImageBytes;
+
+@end
+
+/**
+ * Provides an interface to use for providing a image caching strategy.
+ */
+@protocol RCTImageCache <NSObject>
+
+- (UIImage *)imageForUrl:(NSString *)url size:(CGSize)size scale:(CGFloat)scale resizeMode:(RCTResizeMode)resizeMode;
+
+- (void)addImageToCache:(UIImage *)image
+                    URL:(NSString *)url
+                   size:(CGSize)size
+                  scale:(CGFloat)scale
+             resizeMode:(RCTResizeMode)resizeMode
+               response:(NSURLResponse *)response;
+
+@end
+
+@interface RCTImageCache : NSObject <RCTImageCache>
+
+RCT_EXTERN void RCTSetImageCacheLimits(
+    NSUInteger maxCacheableDecodedImageSizeInBytes,
+    NSUInteger imageCacheTotalCostLimit);
+
+@end