feat: Add inventory management feature with CRUD operations

- Implemented inventory screen to display items with details.
- Added create, edit, and consume inventory screens for managing items.
- Introduced consumption history screen to track item usage.
- Created inventory repository and providers for API interactions.
- Enhanced routing to include inventory-related paths.
- Added necessary models for inventory items and consumption history.
- Integrated error handling and loading states for better user experience.

flutter/lib/core/router/app_router.dart

@@ -11,6 +11,12 @@ import '../../features/recipes/presentation/create_recipe_screen.dart';
 import '../../features/recipes/presentation/recipe_detail_screen.dart';
 import '../../features/recipes/presentation/recipe_edit_screen.dart';
 import '../../features/recipes/presentation/recipes_screen.dart';
+import '../../features/inventory/presentation/inventory_screen.dart';
+import '../../features/inventory/presentation/inventory_detail_screen.dart';
+import '../../features/inventory/presentation/create_inventory_screen.dart';
+import '../../features/inventory/presentation/inventory_edit_screen.dart';
+import '../../features/inventory/presentation/consume_inventory_screen.dart';
+import '../../features/inventory/presentation/consumption_history_screen.dart';
 
 final appRouterProvider = Provider<GoRouter>((ref) {
   final authState = ref.watch(authStateProvider);
@@ -84,6 +90,60 @@ final appRouterProvider = Provider<GoRouter>((ref) {
           return RecipeEditScreen(recipeId: id);
         },
       ),
+      // Inventory detail routes — outside ShellRoute for full-screen.
+      // /inventory/create must be listed before /inventory/:id.
+      GoRoute(
+        path: '/inventory/create',
+        builder: (context, state) => const CreateInventoryScreen(),
+      ),
+      GoRoute(
+        path: '/inventory/:id',
+        redirect: (context, state) {
+          final raw = state.pathParameters['id'] ?? '';
+          if (int.tryParse(raw) == null) return '/inventory';
+          return null;
+        },
+        builder: (context, state) {
+          final id = int.parse(state.pathParameters['id']!);
+          return InventoryDetailScreen(itemId: id);
+        },
+      ),
+      GoRoute(
+        path: '/inventory/:id/edit',
+        redirect: (context, state) {
+          final raw = state.pathParameters['id'] ?? '';
+          if (int.tryParse(raw) == null) return '/inventory';
+          return null;
+        },
+        builder: (context, state) {
+          final id = int.parse(state.pathParameters['id']!);
+          return InventoryEditScreen(itemId: id);
+        },
+      ),
+      GoRoute(
+        path: '/inventory/:id/consume',
+        redirect: (context, state) {
+          final raw = state.pathParameters['id'] ?? '';
+          if (int.tryParse(raw) == null) return '/inventory';
+          return null;
+        },
+        builder: (context, state) {
+          final id = int.parse(state.pathParameters['id']!);
+          return ConsumeInventoryScreen(itemId: id);
+        },
+      ),
+      GoRoute(
+        path: '/inventory/:id/history',
+        redirect: (context, state) {
+          final raw = state.pathParameters['id'] ?? '';
+          if (int.tryParse(raw) == null) return '/inventory';
+          return null;
+        },
+        builder: (context, state) {
+          final id = int.parse(state.pathParameters['id']!);
+          return ConsumptionHistoryScreen(itemId: id);
+        },
+      ),
       // Shell routes — shared AppShell with navigation bar.
       ShellRoute(
         builder: (context, state, child) {
@@ -94,6 +154,10 @@ final appRouterProvider = Provider<GoRouter>((ref) {
             path: '/recipes',
             builder: (context, state) => const RecipesScreen(),
           ),
+          GoRoute(
+            path: '/inventory',
+            builder: (context, state) => const InventoryScreen(),
+          ),
           GoRoute(
             path: '/profile',
             builder: (context, state) => const ProfileScreen(),

flutter/lib/core/ui/app_shell.dart

@@ -21,6 +21,12 @@ class AppShell extends ConsumerWidget {
       icon: Icons.restaurant_menu,
       label: 'Recept',
     ),
+    _AppDestination(
+      path: '/inventory',
+      title: 'Inventarie',
+      icon: Icons.inventory_2_outlined,
+      label: 'Inventarie',
+    ),
     _AppDestination(
       path: '/profile',
       title: 'Profil',