feat(shopping): finalize GET /v1/shopping-list endpoint and regenerate OpenAPI types

Renamed endpoint to /v1/shopping-list to avoid Springdoc path conflict.
Added @RequiresHouseholdRole("planner") on generate. Regenerated
frontend OpenAPI schema with all new shopping list endpoints.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/main/java/com/recipeapp/shopping/ShoppingListController.java

@@ -22,7 +22,7 @@ public class ShoppingListController {
         this.householdResolver = householdResolver;
     }
 
-    @GetMapping("/v1/shopping-lists")
+    @GetMapping("/v1/shopping-list")
     public ShoppingListResponse getByWeekStart(
             @RequestParam(required = false) LocalDate weekStart,
             Principal principal) {