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/planning/entity/CookingLog.java

@@ -0,0 +1,47 @@
+package com.recipeapp.planning.entity;
+
+import com.recipeapp.auth.entity.UserAccount;
+import com.recipeapp.household.entity.Household;
+import com.recipeapp.recipe.entity.Recipe;
+import jakarta.persistence.*;
+import java.time.LocalDate;
+import java.util.UUID;
+
+@Entity
+@Table(name = "cooking_log")
+public class CookingLog {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.UUID)
+    private UUID id;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "recipe_id", nullable = false)
+    private Recipe recipe;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "household_id", nullable = false)
+    private Household household;
+
+    @Column(name = "cooked_on", nullable = false)
+    private LocalDate cookedOn;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "cooked_by", nullable = false)
+    private UserAccount cookedBy;
+
+    protected CookingLog() {}
+
+    public CookingLog(Recipe recipe, Household household, LocalDate cookedOn, UserAccount cookedBy) {
+        this.recipe = recipe;
+        this.household = household;
+        this.cookedOn = cookedOn;
+        this.cookedBy = cookedBy;
+    }
+
+    public UUID getId() { return id; }
+    public Recipe getRecipe() { return recipe; }
+    public Household getHousehold() { return household; }
+    public LocalDate getCookedOn() { return cookedOn; }
+    public UserAccount getCookedBy() { return cookedBy; }
+}

backend/src/main/java/com/recipeapp/planning/entity/WeekPlan.java

@@ -0,0 +1,50 @@
+package com.recipeapp.planning.entity;
+
+import com.recipeapp.household.entity.Household;
+import jakarta.persistence.*;
+import java.time.Instant;
+import java.time.LocalDate;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+
+@Entity
+@Table(name = "week_plan")
+public class WeekPlan {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.UUID)
+    private UUID id;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "household_id", nullable = false)
+    private Household household;
+
+    @Column(name = "week_start", nullable = false)
+    private LocalDate weekStart;
+
+    @Column(nullable = false, length = 10)
+    private String status = "draft";
+
+    @Column(name = "confirmed_at")
+    private Instant confirmedAt;
+
+    @OneToMany(mappedBy = "weekPlan", cascade = CascadeType.ALL, orphanRemoval = true)
+    private List<WeekPlanSlot> slots = new ArrayList<>();
+
+    protected WeekPlan() {}
+
+    public WeekPlan(Household household, LocalDate weekStart) {
+        this.household = household;
+        this.weekStart = weekStart;
+    }
+
+    public UUID getId() { return id; }
+    public Household getHousehold() { return household; }
+    public LocalDate getWeekStart() { return weekStart; }
+    public String getStatus() { return status; }
+    public void setStatus(String status) { this.status = status; }
+    public Instant getConfirmedAt() { return confirmedAt; }
+    public void setConfirmedAt(Instant confirmedAt) { this.confirmedAt = confirmedAt; }
+    public List<WeekPlanSlot> getSlots() { return slots; }
+}

backend/src/main/java/com/recipeapp/planning/entity/WeekPlanSlot.java

@@ -0,0 +1,40 @@
+package com.recipeapp.planning.entity;
+
+import com.recipeapp.recipe.entity.Recipe;
+import jakarta.persistence.*;
+import java.time.LocalDate;
+import java.util.UUID;
+
+@Entity
+@Table(name = "week_plan_slot")
+public class WeekPlanSlot {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.UUID)
+    private UUID id;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "week_plan_id", nullable = false)
+    private WeekPlan weekPlan;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "recipe_id", nullable = false)
+    private Recipe recipe;
+
+    @Column(name = "slot_date", nullable = false)
+    private LocalDate slotDate;
+
+    protected WeekPlanSlot() {}
+
+    public WeekPlanSlot(WeekPlan weekPlan, Recipe recipe, LocalDate slotDate) {
+        this.weekPlan = weekPlan;
+        this.recipe = recipe;
+        this.slotDate = slotDate;
+    }
+
+    public UUID getId() { return id; }
+    public WeekPlan getWeekPlan() { return weekPlan; }
+    public Recipe getRecipe() { return recipe; }
+    public void setRecipe(Recipe recipe) { this.recipe = recipe; }
+    public LocalDate getSlotDate() { return slotDate; }
+}