chore: merge master — adopt SlotResponse.SlotRecipe in SuggestionItem

Resolves conflict by keeping master's refactor: SuggestionItem now reuses
SlotResponse.SlotRecipe instead of the dedicated SuggestionRecipe record,
removing the duplication and adding heroImageUrl to suggestion responses.

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

backend/src/main/java/com/recipeapp/planning/PlanningService.java

@@ -153,7 +153,7 @@ public class PlanningService {
                             plan, candidate, slotDate, config, recentlyCookedIds);
                     double scoreDelta = simulatedScore - currentScore;
                     boolean hasConflict = scoreDelta < 0;
-                    return new SuggestionResponse.SuggestionItem(toSuggestionRecipe(candidate), scoreDelta, hasConflict);
+                    return new SuggestionResponse.SuggestionItem(toSlotRecipe(candidate), scoreDelta, hasConflict);
                 })
                 .sorted((a, b) -> Double.compare(b.scoreDelta(), a.scoreDelta()))
                 .limit(limit)
@@ -422,11 +422,6 @@ public class PlanningService {
                 recipe.getCookTimeMin(), recipe.getHeroImageUrl());
     }
 
-    private SuggestionResponse.SuggestionRecipe toSuggestionRecipe(Recipe recipe) {
-        return new SuggestionResponse.SuggestionRecipe(recipe.getId(), recipe.getName(),
-                recipe.getEffort(), recipe.getCookTimeMin());
-    }
-
     private boolean hasConsecutiveDays(List<LocalDate> days) {
         if (days.size() < 2) return false;
         List<LocalDate> sorted = days.stream().sorted().toList();

backend/src/main/java/com/recipeapp/planning/dto/SuggestionResponse.java

@@ -1,14 +1,11 @@
 package com.recipeapp.planning.dto;
 
 import java.util.List;
-import java.util.UUID;
 
 public record SuggestionResponse(List<SuggestionItem> suggestions) {
 
-    public record SuggestionRecipe(UUID id, String name, String effort, short cookTimeMin) {}
-
     public record SuggestionItem(
-            SuggestionRecipe recipe,
+            SlotResponse.SlotRecipe recipe,
             double scoreDelta,
             boolean hasConflict
     ) {}

backend/src/test/java/com/recipeapp/planning/WeekPlanControllerTest.java

@@ -161,7 +161,7 @@ class WeekPlanControllerTest {
 
     @Test
     void getSuggestionsShouldReturn200() throws Exception {
-        var recipe = new SuggestionResponse.SuggestionRecipe(UUID.randomUUID(), "Stir Fry", "easy", (short) 15);
+        var recipe = new SlotResponse.SlotRecipe(UUID.randomUUID(), "Stir Fry", "easy", (short) 15, null);
         var item = new SuggestionResponse.SuggestionItem(recipe, 1.5, false);
         var response = new SuggestionResponse(List.of(item));