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/pantry/pantry.controller.d.ts

@@ -7,13 +7,13 @@ export declare class PantryController {
         userId: number;
     }): import(".prisma/client").Prisma.PrismaPromise<({
         product: {
+            name: string;
             category: string | null;
             status: string;
-            name: string;
-            categoryId: number | null;
-            canonicalName: string | null;
             id: number;
+            categoryId: number | null;
             normalizedName: string;
+            canonicalName: string | null;
             isActive: boolean;
             deletedAt: Date | null;
             createdAt: Date;
@@ -32,13 +32,13 @@ export declare class PantryController {
         userId: number;
     }, body: CreatePantryItemDto): Promise<{
         product: {
+            name: string;
             category: string | null;
             status: string;
-            name: string;
-            categoryId: number | null;
-            canonicalName: string | null;
             id: number;
+            categoryId: number | null;
             normalizedName: string;
+            canonicalName: string | null;
             isActive: boolean;
             deletedAt: Date | null;
             createdAt: Date;