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.controller.js

@@ -36,6 +36,12 @@ __decorate([
     (0, class_validator_1.IsBoolean)(),
     __metadata("design:type", Boolean)
 ], SetRecipeSharingDto.prototype, "canShareRecipes", void 0);
+class SetAiEngineEnabledDto {
+}
+__decorate([
+    (0, class_validator_1.IsBoolean)(),
+    __metadata("design:type", Boolean)
+], SetAiEngineEnabledDto.prototype, "aiEngineEnabled", void 0);
 class AdminCreateUserDto {
 }
 __decorate([
@@ -125,6 +131,10 @@ let UsersController = class UsersController {
         const updated = await this.usersService.setRecipeSharing(id, dto.canShareRecipes);
         return { id: updated.id, username: updated.username, canShareRecipes: updated.canShareRecipes };
     }
+    async setAiEngineEnabled(id, dto) {
+        const updated = await this.usersService.setAiEngineEnabled(id, dto.aiEngineEnabled);
+        return { id: updated.id, username: updated.username, aiEngineEnabled: updated.aiEngineEnabled };
+    }
     async adminCreateUser(dto) {
         const user = await this.usersService.adminCreate(dto);
         return { id: user.id, username: user.username, email: user.email, role: user.role, createdAt: user.createdAt };
@@ -209,6 +219,15 @@ __decorate([
     __metadata("design:paramtypes", [Number, SetRecipeSharingDto]),
     __metadata("design:returntype", Promise)
 ], UsersController.prototype, "setRecipeSharing", null);
+__decorate([
+    (0, roles_decorator_1.Roles)('admin'),
+    (0, common_1.Patch)(':id/ai-engine'),
+    __param(0, (0, common_1.Param)('id', common_1.ParseIntPipe)),
+    __param(1, (0, common_1.Body)()),
+    __metadata("design:type", Function),
+    __metadata("design:paramtypes", [Number, SetAiEngineEnabledDto]),
+    __metadata("design:returntype", Promise)
+], UsersController.prototype, "setAiEngineEnabled", null);
 __decorate([
     (0, roles_decorator_1.Roles)('admin'),
     (0, common_1.Post)(),