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/test/admin_aliases_panel_test.dart

@@ -3,6 +3,8 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:recipe_flutter/features/admin/data/admin_repository.dart';
 import 'package:recipe_flutter/features/admin/domain/admin_ai_categorize_result.dart';
+import 'package:recipe_flutter/features/admin/domain/admin_ai_trace.dart';
+import 'package:recipe_flutter/features/admin/domain/admin_ai_trace_detail.dart';
 import 'package:recipe_flutter/features/admin/domain/admin_category_node.dart';
 import 'package:recipe_flutter/features/admin/domain/admin_inventory_item.dart';
 import 'package:recipe_flutter/features/admin/domain/admin_pantry_item.dart';
@@ -20,99 +22,187 @@ class TestAdminRepositoryWrapper implements AdminRepository {
   TestAdminRepositoryWrapper(this._fakeRepo);
 
   @override
-  Future<List<ReceiptAlias>> listReceiptAliases() => _fakeRepo.listReceiptAliases();
+  Future<List<ReceiptAlias>> listReceiptAliases() =>
+      _fakeRepo.listReceiptAliases();
 
   @override
-  Future<List<AdminProduct>> listGlobalProducts() => _fakeRepo.listGlobalProducts();
+  Future<List<AdminProduct>> listGlobalProducts() =>
+      _fakeRepo.listGlobalProducts();
 
   @override
-  Future<void> updateReceiptAlias(int id, {String? receiptName, int? productId, bool? isGlobal}) => _fakeRepo.updateReceiptAlias(id, receiptName: receiptName, productId: productId, isGlobal: isGlobal);
+  Future<void> updateReceiptAlias(int id,
+          {String? receiptName, int? productId, bool? isGlobal}) =>
+      _fakeRepo.updateReceiptAlias(id,
+          receiptName: receiptName, productId: productId, isGlobal: isGlobal);
 
   // Stub implementations for other required methods
   @override
-  Future<List<AdminAiCategorizeResult>> aiCategorizeBulk({List<int>? productIds}) => throw UnimplementedError();
+  Future<List<AdminAiCategorizeResult>> aiCategorizeBulk(
+          {List<int>? productIds}) =>
+      throw UnimplementedError();
   @override
-  Future<int> bulkSetCategory(List<int> ids, {required int? categoryId}) => throw UnimplementedError();
+  Future<int> bulkSetCategory(List<int> ids, {required int? categoryId}) =>
+      throw UnimplementedError();
   @override
-  Future<AdminInventoryItem> createAdminInventory({int? userId, required int productId, required double quantity, required String unit, String? location, String? brand, String? receiptName, String? suitableFor, String? comment}) => throw UnimplementedError();
+  Future<AdminInventoryItem> createAdminInventory(
+          {int? userId,
+          required int productId,
+          required double quantity,
+          required String unit,
+          String? location,
+          String? brand,
+          String? receiptName,
+          String? suitableFor,
+          String? comment}) =>
+      throw UnimplementedError();
   @override
-  Future<AdminPantryItem> createAdminPantry({int? userId, required int productId, String? location}) => throw UnimplementedError();
+  Future<AdminPantryItem> createAdminPantry(
+          {int? userId, required int productId, String? location}) =>
+      throw UnimplementedError();
   @override
-  Future<Map<String, dynamic>> createProduct(String name, {int? categoryId}) => throw UnimplementedError();
+  Future<Map<String, dynamic>> createProduct(String name, {int? categoryId}) =>
+      throw UnimplementedError();
   @override
-  Future<UserAdmin> createUser({required String username, required String email, required String password, String role = 'user'}) => throw UnimplementedError();
+  Future<UserAdmin> createUser(
+          {required String username,
+          required String email,
+          required String password,
+          String role = 'user'}) =>
+      throw UnimplementedError();
   @override
   Future<void> deleteUser(int userId) => throw UnimplementedError();
   @override
-  Future<List<AdminInventoryItem>> listAdminInventory({int? userId, String? sort}) => throw UnimplementedError();
+  Future<List<AdminInventoryItem>> listAdminInventory(
+          {int? userId, String? sort}) =>
+      throw UnimplementedError();
   @override
-  Future<List<AdminPantryItem>> listAdminPantry({int? userId}) => throw UnimplementedError();
+  Future<List<AdminPantryItem>> listAdminPantry({int? userId}) =>
+      throw UnimplementedError();
   @override
   Future<List<AiModelInfo>> listAiModels() => throw UnimplementedError();
   @override
-  Future<List<AdminCategoryNode>> listCategoryTree() => throw UnimplementedError();
+  Future<AdminAiTraceDetail> getAiTraceById(String traceId) =>
+      throw UnimplementedError();
   @override
-  Future<List<AdminProduct>> listDeletedProducts() => throw UnimplementedError();
+  Future<AdminAiTraceListResponse> listAiTraces(
+          {required AdminAiTraceSource source,
+          int limit = 25,
+          String? cursor,
+          String? period,
+          bool onlyErrors = false}) =>
+      throw UnimplementedError();
   @override
-  Future<List<PendingProduct>> listPendingProducts() => throw UnimplementedError();
+  Future<List<AdminCategoryNode>> listCategoryTree() =>
+      throw UnimplementedError();
   @override
-  Future<List<PendingProduct>> listPrivateProducts() => throw UnimplementedError();
+  Future<List<AdminProduct>> listDeletedProducts() =>
+      throw UnimplementedError();
+  @override
+  Future<List<PendingProduct>> listPendingProducts() =>
+      throw UnimplementedError();
+  @override
+  Future<List<PendingProduct>> listPrivateProducts() =>
+      throw UnimplementedError();
   @override
   Future<List<AdminProduct>> listProducts() => throw UnimplementedError();
   @override
-  Future<List<AdminProduct>> listSelectableProductsForAdmin({bool forceRefresh = false}) => throw UnimplementedError();
+  Future<List<AdminProduct>> listSelectableProductsForAdmin(
+          {bool forceRefresh = false}) =>
+      throw UnimplementedError();
   @override
   Future<List<UserAdmin>> listUsers() => throw UnimplementedError();
   @override
-  Future<void> mergeAdminInventory({required int sourceInventoryId, required int targetInventoryId}) => throw UnimplementedError();
+  Future<void> mergeAdminInventory(
+          {required int sourceInventoryId, required int targetInventoryId}) =>
+      throw UnimplementedError();
   @override
-  Future<void> mergeProducts({required int sourceProductId, required int targetProductId}) => throw UnimplementedError();
+  Future<void> mergeProducts(
+          {required int sourceProductId, required int targetProductId}) =>
+      throw UnimplementedError();
   @override
-  Future<void> mergeProductsPrivate({required int sourceProductId, required int targetProductId}) => throw UnimplementedError();
+  Future<void> mergeProductsPrivate(
+          {required int sourceProductId, required int targetProductId}) =>
+      throw UnimplementedError();
   @override
-  Future<void> moveAdminInventoryToPantry(int inventoryId) => throw UnimplementedError();
+  Future<void> moveAdminInventoryToPantry(int inventoryId) =>
+      throw UnimplementedError();
   @override
-  Future<void> moveAdminPantryToInventory(int pantryItemId, Map<String, dynamic> body) => throw UnimplementedError();
+  Future<void> moveAdminPantryToInventory(
+          int pantryItemId, Map<String, dynamic> body) =>
+      throw UnimplementedError();
   @override
-  Future<Map<String, dynamic>> previewAdminInventoryMerge({required int sourceInventoryId, required int targetInventoryId}) => throw UnimplementedError();
+  Future<Map<String, dynamic>> previewAdminInventoryMerge(
+          {required int sourceInventoryId, required int targetInventoryId}) =>
+      throw UnimplementedError();
   @override
-  Future<Map<String, dynamic>> previewMerge({required int sourceProductId, required int targetProductId}) => throw UnimplementedError();
+  Future<Map<String, dynamic>> previewMerge(
+          {required int sourceProductId, required int targetProductId}) =>
+      throw UnimplementedError();
   @override
-  Future<AdminProduct> promotePrivateProduct(int productId) => throw UnimplementedError();
+  Future<AdminProduct> promotePrivateProduct(int productId) =>
+      throw UnimplementedError();
   @override
-  Future<void> removeAdminInventory(int inventoryId) => throw UnimplementedError();
+  Future<void> removeAdminInventory(int inventoryId) =>
+      throw UnimplementedError();
   @override
-  Future<void> removeAdminPantryItem(int pantryItemId) => throw UnimplementedError();
+  Future<void> removeAdminPantryItem(int pantryItemId) =>
+      throw UnimplementedError();
   @override
   Future<void> removeProduct(int productId) => throw UnimplementedError();
   @override
   Future<void> removeReceiptAlias(int id) => throw UnimplementedError();
   @override
-  Future<Map<String, dynamic>> resetPassword(int userId) => throw UnimplementedError();
+  Future<Map<String, dynamic>> resetPassword(int userId) =>
+      throw UnimplementedError();
   @override
   Future<void> restoreProduct(int productId) => throw UnimplementedError();
   @override
-  Future<UserAdmin> setPremium(int userId, {required bool isPremium}) => throw UnimplementedError();
+  Future<UserAdmin> setPremium(int userId, {required bool isPremium}) =>
+      throw UnimplementedError();
   @override
-  Future<void> setProductCategory(int productId, {required int? categoryId}) => throw UnimplementedError();
+  Future<void> setProductCategory(int productId, {required int? categoryId}) =>
+      throw UnimplementedError();
   @override
-  Future<void> setProductStatus(int productId, String status) => throw UnimplementedError();
+  Future<void> setProductStatus(int productId, String status) =>
+      throw UnimplementedError();
   @override
-  Future<UserAdmin> setRecipeSharing(int userId, {required bool canShareRecipes}) => throw UnimplementedError();
+  Future<UserAdmin> setRecipeSharing(int userId,
+          {required bool canShareRecipes}) =>
+      throw UnimplementedError();
   @override
-  Future<UserAdmin> setRole(int userId, String newRole) => throw UnimplementedError();
+  Future<UserAdmin> setRole(int userId, String newRole) =>
+      throw UnimplementedError();
   @override
-  Future<AdminInventoryItem> updateAdminInventory(int inventoryId, {int? productId, double? quantity, String? unit, String? location, String? brand, String? receiptName, String? suitableFor, String? comment}) => throw UnimplementedError();
+  Future<AdminInventoryItem> updateAdminInventory(int inventoryId,
+          {int? productId,
+          double? quantity,
+          String? unit,
+          String? location,
+          String? brand,
+          String? receiptName,
+          String? suitableFor,
+          String? comment}) =>
+      throw UnimplementedError();
   @override
-  Future<AdminPantryItem> updateAdminPantry(int pantryItemId, {int? productId, String? location}) => throw UnimplementedError();
+  Future<AdminPantryItem> updateAdminPantry(int pantryItemId,
+          {int? productId, String? location}) =>
+      throw UnimplementedError();
   @override
-  Future<void> updateCanonicalName(int productId, String canonicalName) => throw UnimplementedError();
+  Future<void> updateCanonicalName(int productId, String canonicalName) =>
+      throw UnimplementedError();
   @override
-  Future<void> updateCanonicalNamePrivate(int productId, String canonicalName) => throw UnimplementedError();
+  Future<void> updateCanonicalNamePrivate(
+          int productId, String canonicalName) =>
+      throw UnimplementedError();
   @override
-  Future<void> updateEmail(int userId, String email) => throw UnimplementedError();
+  Future<void> updateEmail(int userId, String email) =>
+      throw UnimplementedError();
   @override
-  Future<void> upsertReceiptAlias({required String receiptName, required int productId, bool isGlobal = false}) => throw UnimplementedError();
+  Future<void> upsertReceiptAlias(
+          {required String receiptName,
+          required int productId,
+          bool isGlobal = false}) =>
+      throw UnimplementedError();
 }
 
 // Simple fake that only implements the methods we need
@@ -128,7 +218,8 @@ class FakeAdminRepository {
     return _products;
   }
 
-  Future<void> updateReceiptAlias(int id, {String? receiptName, int? productId, bool? isGlobal}) async {
+  Future<void> updateReceiptAlias(int id,
+      {String? receiptName, int? productId, bool? isGlobal}) async {
     // Find and update alias
     final index = _aliases.indexWhere((a) => a.id == id);
     if (index >= 0) {