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/RecipeRepository.java

@@ -0,0 +1,57 @@
+package com.recipeapp.recipe;
+
+import com.recipeapp.recipe.dto.RecipeSummaryResponse;
+import com.recipeapp.recipe.entity.Recipe;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+public interface RecipeRepository extends JpaRepository<Recipe, UUID> {
+
+    Optional<Recipe> findByIdAndHouseholdIdAndDeletedAtIsNull(UUID id, UUID householdId);
+
+    List<Recipe> findByHouseholdIdAndDeletedAtIsNull(UUID householdId);
+
+    @Query("""
+            SELECT new com.recipeapp.recipe.dto.RecipeSummaryResponse(
+                r.id, r.name, r.serves, r.cookTimeMin, r.effort, r.isChildFriendly, r.heroImageUrl)
+            FROM Recipe r
+            WHERE r.household.id = :householdId
+              AND r.deletedAt IS NULL
+              AND (:search IS NULL OR LOWER(r.name) LIKE LOWER(CONCAT('%', :search, '%')))
+              AND (:effort IS NULL OR r.effort = :effort)
+              AND (:isChildFriendly IS NULL OR r.isChildFriendly = :isChildFriendly)
+              AND (:cookTimeMaxMin IS NULL OR r.cookTimeMin <= :cookTimeMaxMin)
+            ORDER BY r.createdAt DESC
+            """)
+    List<RecipeSummaryResponse> findFiltered(
+            @Param("householdId") UUID householdId,
+            @Param("search") String search,
+            @Param("effort") String effort,
+            @Param("isChildFriendly") Boolean isChildFriendly,
+            @Param("cookTimeMaxMin") Integer cookTimeMaxMin,
+            @Param("sort") String sort,
+            @Param("limit") int limit,
+            @Param("offset") int offset);
+
+    @Query("""
+            SELECT COUNT(r)
+            FROM Recipe r
+            WHERE r.household.id = :householdId
+              AND r.deletedAt IS NULL
+              AND (:search IS NULL OR LOWER(r.name) LIKE LOWER(CONCAT('%', :search, '%')))
+              AND (:effort IS NULL OR r.effort = :effort)
+              AND (:isChildFriendly IS NULL OR r.isChildFriendly = :isChildFriendly)
+              AND (:cookTimeMaxMin IS NULL OR r.cookTimeMin <= :cookTimeMaxMin)
+            """)
+    long countFiltered(
+            @Param("householdId") UUID householdId,
+            @Param("search") String search,
+            @Param("effort") String effort,
+            @Param("isChildFriendly") Boolean isChildFriendly,
+            @Param("cookTimeMaxMin") Integer cookTimeMaxMin);
+}