feat: refactor API paths for authentication, inventory, and recipes; add contract tests for repositories

flutter/lib/features/inventory/data/inventory_repository.dart

@@ -1,4 +1,5 @@
 import '../../../core/api/api_client.dart';
+import '../../../core/api/api_paths.dart';
 import '../domain/inventory_item.dart';
 import '../domain/inventory_consumption.dart';
 
@@ -20,21 +21,21 @@ class InventoryRepository {
         ? ''
         : '?${params.entries.map((e) => '${e.key}=${Uri.encodeComponent(e.value)}').join('&')}';
 
-    final data = await _api.getJson('/inventory$query', token: token);
+    final data = await _api.getJson('${InventoryApiPaths.list}$query', token: token);
     final list = data as List<dynamic>;
     return list.map((e) => InventoryItem.fromJson(e as Map<String, dynamic>)).toList();
   }
 
   Future<InventoryItem> fetchInventoryItem(int id, {String? token}) async {
-    final data = await _api.getJson('/inventory/$id', token: token);
-    return InventoryItem.fromJson(data as Map<String, dynamic>);
+    final items = await fetchInventory(token: token);
+    return items.firstWhere((item) => item.id == id);
   }
 
   Future<InventoryItem> createInventoryItem(
     Map<String, dynamic> body, {
     String? token,
   }) async {
-    final data = await _api.postJson('/inventory', body: body, token: token);
+    final data = await _api.postJson(InventoryApiPaths.list, body: body, token: token);
     return InventoryItem.fromJson(data as Map<String, dynamic>);
   }
 
@@ -43,12 +44,12 @@ class InventoryRepository {
     Map<String, dynamic> body, {
     String? token,
   }) async {
-    final data = await _api.patchJson('/inventory/$id', body: body, token: token);
+    final data = await _api.patchJson(InventoryApiPaths.update(id), body: body, token: token);
     return InventoryItem.fromJson(data as Map<String, dynamic>);
   }
 
   Future<void> deleteInventoryItem(int id, {String? token}) async {
-    await _api.deleteJson('/inventory/$id', token: token);
+    await _api.deleteJson(InventoryApiPaths.remove(id), token: token);
   }
 
   Future<InventoryItem> consumeInventoryItem(
@@ -59,7 +60,7 @@ class InventoryRepository {
   }) async {
     final body = <String, dynamic>{'amountUsed': amountUsed};
     if (comment != null && comment.isNotEmpty) body['comment'] = comment;
-    final data = await _api.postJson('/inventory/$id/consume', body: body, token: token);
+    final data = await _api.postJson(InventoryApiPaths.consume(id), body: body, token: token);
     return InventoryItem.fromJson(data as Map<String, dynamic>);
   }
 
@@ -67,7 +68,7 @@ class InventoryRepository {
     int id, {
     String? token,
   }) async {
-    final data = await _api.getJson('/inventory/$id/consumption-history', token: token);
+    final data = await _api.getJson(InventoryApiPaths.consumptionHistory(id), token: token);
     final list = data as List<dynamic>;
     return list
         .map((e) => InventoryConsumption.fromJson(e as Map<String, dynamic>))

flutter/lib/features/inventory/presentation/create_inventory_screen.dart

@@ -3,6 +3,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
 import '../../../core/api/api_error_mapper.dart';
+import '../../../core/api/api_paths.dart';
 import '../../../core/api/api_providers.dart';
 import '../../../core/forms/form_options.dart';
 import '../../auth/data/auth_providers.dart';
@@ -54,7 +55,7 @@ class _CreateInventoryScreenState
     try {
       final token = await ref.read(authStateProvider.future);
       final api = ref.read(apiClientProvider);
-      final data = await api.getJson('/products', token: token);
+      final data = await api.getJson(ProductApiPaths.list, token: token);
       if (mounted) {
         setState(() {
           _products = (data as List<dynamic>)