refactor(recipes): drop is_child_friendly column and remove from all layers

V025 migration drops the column. Removed from Recipe entity, RecipeDetailResponse,
RecipeSummaryResponse, RecipeRepository JPQL, RecipeService, and RecipeController.

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

frontend/src/lib/api/schema.d.ts

@@ -552,7 +552,6 @@ export interface components {
             /** Format: int32 */
             cookTimeMin?: number;
             effort: string;
-            isChildFriendly?: boolean;
             heroImageUrl?: string;
             ingredients: components["schemas"]["IngredientEntry"][];
             steps?: components["schemas"]["StepEntry"][];
@@ -587,7 +586,6 @@ export interface components {
             /** Format: int32 */
             cookTimeMin?: number;
             effort?: string;
-            isChildFriendly?: boolean;
             heroImageUrl?: string;
             ingredients?: components["schemas"]["IngredientItem"][];
             steps?: components["schemas"]["StepItem"][];
@@ -934,8 +932,7 @@ export interface components {
             /** Format: int32 */
             cookTimeMin?: number;
             effort?: string;
-            isChildFriendly?: boolean;
-            heroImageUrl?: string;
+            heroImagePreview?: string;
         };
         ApiResponseListAdminUserResponse: {
             status?: string;