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>

flutter/lib/features/recipes/data/recipe_repository.dart

@@ -196,6 +196,28 @@ class RecipeRepository {
     }
   }
 
+  Future<RecipeAnalysis> rematchRecipeIngredients(int id,
+      {String? token}) async {
+    try {
+      final data = await _api.postJson(
+        RecipeApiPaths.rematch(id),
+        body: const {},
+        token: token,
+      );
+      if (data is! Map<String, dynamic>) {
+        throw const ApiException(
+            type: ApiErrorType.unknown, message: 'Ogiltigt svar från servern.');
+      }
+      return RecipeAnalysis.fromJson(data);
+    } on ApiException {
+      rethrow;
+    } catch (_) {
+      throw const ApiException(
+          type: ApiErrorType.network,
+          message: 'Kunde inte köra om matchning.');
+    }
+  }
+
   Future<ParsedRecipe> parseMarkdown(String markdown,
       {String? token}) async {
     try {