feat: add recipe creation, editing, and detail screens; enhance recipe model with instructions and ingredients

flutter/lib/core/router/app_router.dart

@@ -7,6 +7,9 @@ import '../ui/async_state_views.dart';
 import '../../features/auth/data/auth_providers.dart';
 import '../../features/auth/presentation/login_screen.dart';
 import '../../features/profile/presentation/profile_screen.dart';
+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';
 
 final appRouterProvider = Provider<GoRouter>((ref) {
@@ -22,22 +25,18 @@ final appRouterProvider = Provider<GoRouter>((ref) {
       final isSplash = location == '/';
       final isLogin = location == '/login';
 
-      // Keep user on splash while auth state is being resolved from storage.
       if (isLoading) {
         return isSplash ? null : '/';
       }
 
-      // Redirect away from splash once auth is known.
       if (isSplash) {
         return isLoggedIn ? '/recipes' : '/login';
       }
 
-      // Unauthenticated user trying to reach a protected route.
       if (!isLoggedIn && !isLogin) {
         return '/login';
       }
 
-      // Authenticated user landing on login.
       if (isLoggedIn && isLogin) {
         return '/recipes';
       }
@@ -55,6 +54,37 @@ final appRouterProvider = Provider<GoRouter>((ref) {
         path: '/login',
         builder: (context, state) => const LoginScreen(),
       ),
+      // Detail routes — outside ShellRoute to get full-screen with back button.
+      // /recipes/create must be listed before /recipes/:id to avoid conflict.
+      GoRoute(
+        path: '/recipes/create',
+        builder: (context, state) => const CreateRecipeScreen(),
+      ),
+      GoRoute(
+        path: '/recipes/:id',
+        redirect: (context, state) {
+          final raw = state.pathParameters['id'] ?? '';
+          if (int.tryParse(raw) == null) return '/recipes';
+          return null;
+        },
+        builder: (context, state) {
+          final id = int.parse(state.pathParameters['id']!);
+          return RecipeDetailScreen(recipeId: id);
+        },
+      ),
+      GoRoute(
+        path: '/recipes/:id/edit',
+        redirect: (context, state) {
+          final raw = state.pathParameters['id'] ?? '';
+          if (int.tryParse(raw) == null) return '/recipes';
+          return null;
+        },
+        builder: (context, state) {
+          final id = int.parse(state.pathParameters['id']!);
+          return RecipeEditScreen(recipeId: id);
+        },
+      ),
+      // Shell routes — shared AppShell with navigation bar.
       ShellRoute(
         builder: (context, state, child) {
           return AppShell(location: state.uri.path, child: child);