Implement Recipe, Planning, Shopping, Pantry, and Admin domains

Outside-in TDD for all 5 remaining domains (128 tests total):
- Recipe: CRUD, ingredients autocomplete/patch, tags, categories (27 tests)
- Planning: week plans, slots, confirm, suggestions, variety score, cooking logs (24 tests)
- Shopping: generate from plan, publish, check/add/remove items (15 tests)
- Pantry: CRUD with expiry sorting (11 tests)
- Admin: user management, password reset, audit logging (13 tests)

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

backend/src/main/java/com/recipeapp/recipe/entity/Recipe.java

@@ -0,0 +1,112 @@
+package com.recipeapp.recipe.entity;
+
+import com.recipeapp.household.entity.Household;
+import jakarta.persistence.*;
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.UUID;
+
+@Entity
+@Table(name = "recipe")
+public class Recipe {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.UUID)
+    private UUID id;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "household_id", nullable = false)
+    private Household household;
+
+    @Column(nullable = false, length = 200)
+    private String name;
+
+    @Column(nullable = false)
+    private short serves;
+
+    @Column(name = "cook_time_min", nullable = false)
+    private short cookTimeMin;
+
+    @Column(nullable = false, length = 10)
+    private String effort;
+
+    @Column(name = "is_child_friendly", nullable = false)
+    private boolean isChildFriendly;
+
+    @Column(name = "hero_image_url", length = 500)
+    private String heroImageUrl;
+
+    @Column(name = "deleted_at")
+    private Instant deletedAt;
+
+    @Column(name = "created_at", nullable = false, updatable = false)
+    private Instant createdAt;
+
+    @Column(name = "updated_at", nullable = false)
+    private Instant updatedAt;
+
+    @OneToMany(mappedBy = "recipe", cascade = CascadeType.ALL, orphanRemoval = true)
+    @OrderBy("sortOrder")
+    private List<RecipeIngredient> ingredients = new ArrayList<>();
+
+    @OneToMany(mappedBy = "recipe", cascade = CascadeType.ALL, orphanRemoval = true)
+    @OrderBy("stepNumber")
+    private List<RecipeStep> steps = new ArrayList<>();
+
+    @ManyToMany
+    @JoinTable(name = "recipe_tag",
+            joinColumns = @JoinColumn(name = "recipe_id"),
+            inverseJoinColumns = @JoinColumn(name = "tag_id"))
+    private Set<Tag> tags = new HashSet<>();
+
+    protected Recipe() {}
+
+    public Recipe(Household household, String name, short serves, short cookTimeMin,
+                  String effort, boolean isChildFriendly) {
+        this.household = household;
+        this.name = name;
+        this.serves = serves;
+        this.cookTimeMin = cookTimeMin;
+        this.effort = effort;
+        this.isChildFriendly = isChildFriendly;
+    }
+
+    @PrePersist
+    void onCreate() {
+        createdAt = Instant.now();
+        updatedAt = Instant.now();
+    }
+
+    @PreUpdate
+    void onUpdate() {
+        updatedAt = Instant.now();
+    }
+
+    public UUID getId() { return id; }
+    public Household getHousehold() { return household; }
+    public String getName() { return name; }
+    public void setName(String name) { this.name = name; }
+    public short getServes() { return serves; }
+    public void setServes(short serves) { this.serves = serves; }
+    public short getCookTimeMin() { return cookTimeMin; }
+    public void setCookTimeMin(short cookTimeMin) { this.cookTimeMin = cookTimeMin; }
+    public String getEffort() { return effort; }
+    public void setEffort(String effort) { this.effort = effort; }
+    public boolean isChildFriendly() { return isChildFriendly; }
+    public void setChildFriendly(boolean childFriendly) { isChildFriendly = childFriendly; }
+    public String getHeroImageUrl() { return heroImageUrl; }
+    public void setHeroImageUrl(String heroImageUrl) { this.heroImageUrl = heroImageUrl; }
+    public Instant getDeletedAt() { return deletedAt; }
+    public void setDeletedAt(Instant deletedAt) { this.deletedAt = deletedAt; }
+    public Instant getCreatedAt() { return createdAt; }
+    public Instant getUpdatedAt() { return updatedAt; }
+    public List<RecipeIngredient> getIngredients() { return ingredients; }
+    public List<RecipeStep> getSteps() { return steps; }
+    public Set<Tag> getTags() { return tags; }
+    public void setTags(Set<Tag> tags) { this.tags = tags; }
+
+    public boolean isDeleted() { return deletedAt != null; }
+}