feat: add rematch functionality for recipe ingredients and enhance inventory management

- Added a new API path for rematching recipe ingredients in `api_paths.dart`.
- Implemented a manual product creation dialog in `inventory_screen.dart` to allow users to create new products directly.
- Integrated the rematch functionality in `recipe_repository.dart` to handle rematching of recipe ingredients.
- Updated the recipe detail screen to include a button for triggering the rematch process.
- Introduced a new `RecipeMatchingService` in the backend to handle ingredient matching logic.
- Added database migration to include `aiEngineEnabled` column in the User table.

Co-authored-by: Copilot <copilot@github.com>

backend/dist/users/users.service.js

@@ -41,6 +41,7 @@ let UsersService = class UsersService {
                 role: true,
                 isPremium: true,
                 canShareRecipes: true,
+                aiEngineEnabled: true,
                 createdAt: true,
             },
             orderBy: { username: 'asc' },
@@ -55,6 +56,9 @@ let UsersService = class UsersService {
     setRecipeSharing(id, canShareRecipes) {
         return this.prisma.user.update({ where: { id }, data: { canShareRecipes } });
     }
+    setAiEngineEnabled(id, aiEngineEnabled) {
+        return this.prisma.user.update({ where: { id }, data: { aiEngineEnabled } });
+    }
     async adminCreate(data) {
         const existing = await this.prisma.user.findFirst({
             where: { OR: [{ username: data.username }, { email: data.email }] },