feat(ai): add AI trace tracking and admin panel

- Add AiTrace model to Prisma schema with relations to User
- Implement AiTraceService with CRUD operations for AI traces
- Add new admin panel for AI traces with filtering and detail views
- Integrate trace persistence in receipt import flow
- Add API endpoints for listing and retrieving AI traces
- Update Flutter admin UI with new AI tab and navigation
- Add new domain models for AI traces and details
- Add migration for AiTrace table creation

BREAKING CHANGE: None

flutter/lib/core/ui/app_shell.dart

@@ -49,19 +49,19 @@ class AppShell extends ConsumerWidget {
       icon: Icons.storefront_outlined,
       label: 'Baslager',
     ),
-    _AppDestination(
-      path: '/import',
-      title: 'Importera',
-      icon: Icons.upload_file_outlined,
-      label: 'Importera',
-    ),
-    _AppDestination(
-      path: '/inkopslista',
-      title: 'Inköpslista',
-      icon: Icons.shopping_cart_outlined,
-      label: 'Inköpslista',
-    ),
-  ];
+    _AppDestination(
+      path: '/import',
+      title: 'Importera',
+      icon: Icons.upload_file_outlined,
+      label: 'Importera',
+    ),
+    _AppDestination(
+      path: '/inkopslista',
+      title: 'Inköpslista',
+      icon: Icons.shopping_cart_outlined,
+      label: 'Inköpslista',
+    ),
+  ];
 
   List<_AppDestination> _destinations() => _baseDestinations;
 
@@ -101,8 +101,8 @@ class AppShell extends ConsumerWidget {
       }
     }
 
-    final isRecipesRoute = location.startsWith('/recipes') &&
-        !location.startsWith('/recipes/');
+    final isRecipesRoute =
+        location.startsWith('/recipes') && !location.startsWith('/recipes/');
     final isImportRoute = location == '/import';
     final isAdminRoute = location.startsWith('/admin');
     final adminTab = AdminViewTabX.fromQuery(
@@ -133,6 +133,12 @@ class AppShell extends ConsumerWidget {
               selected: adminTab == AdminViewTab.database,
               onSelected: (_) => navigateToAdminTab(AdminViewTab.database),
             ),
+            const SizedBox(width: 8),
+            ChoiceChip(
+              label: const Text('AI'),
+              selected: adminTab == AdminViewTab.ai,
+              onSelected: (_) => navigateToAdminTab(AdminViewTab.ai),
+            ),
           ],
         ),
       );
@@ -140,7 +146,8 @@ class AppShell extends ConsumerWidget {
 
     Widget shell = Scaffold(
       appBar: AppBar(
-        title: isAdminRoute ? buildAdminTitle() : Text(selectedDestination.title),
+        title:
+            isAdminRoute ? buildAdminTitle() : Text(selectedDestination.title),
         bottom: isImportRoute
             ? const TabBar(
                 tabs: [
@@ -148,17 +155,17 @@ class AppShell extends ConsumerWidget {
                     icon: Icon(Icons.restaurant_menu_outlined),
                     text: 'Recept',
                   ),
-                  Tab(
-                    icon: Icon(Icons.receipt_long_outlined),
-                    text: 'Kvitto',
-                  ),
-                  Tab(
-                    icon: Icon(Icons.local_offer_outlined),
-                    text: 'Flyer',
-                  ),
-                ],
-              )
-            : null,
+                  Tab(
+                    icon: Icon(Icons.receipt_long_outlined),
+                    text: 'Kvitto',
+                  ),
+                  Tab(
+                    icon: Icon(Icons.local_offer_outlined),
+                    text: 'Flyer',
+                  ),
+                ],
+              )
+            : null,
         actions: [
           if (isRecipesRoute)
             Consumer(
@@ -184,8 +191,9 @@ class AppShell extends ConsumerWidget {
                       PopupMenuButton<int>(
                         icon: const Icon(Icons.grid_view),
                         tooltip: 'Välj antal kolumner',
-                        onSelected: (columns) =>
-                            ref.read(recipesViewProvider.notifier).setColumns(columns),
+                        onSelected: (columns) => ref
+                            .read(recipesViewProvider.notifier)
+                            .setColumns(columns),
                         itemBuilder: (context) => const [
                           PopupMenuItem(value: 2, child: Text('2 kolumner')),
                           PopupMenuItem(value: 4, child: Text('4 kolumner')),
@@ -288,9 +296,9 @@ class AppShell extends ConsumerWidget {
             ),
     );
 
-    if (isImportRoute) {
-      shell = DefaultTabController(length: 3, child: shell);
-    }
+    if (isImportRoute) {
+      shell = DefaultTabController(length: 3, child: shell);
+    }
 
     return shell;
   }