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/RecipeController.java

@@ -0,0 +1,79 @@
+package com.recipeapp.recipe;
+
+import com.recipeapp.common.ApiResponse;
+import com.recipeapp.recipe.dto.*;
+import jakarta.validation.Valid;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.net.URI;
+import java.security.Principal;
+import java.util.List;
+import java.util.UUID;
+
+@RestController
+@RequestMapping("/v1/recipes")
+public class RecipeController {
+
+    private final RecipeService recipeService;
+    private final HouseholdResolver householdResolver;
+
+    public RecipeController(RecipeService recipeService, HouseholdResolver householdResolver) {
+        this.recipeService = recipeService;
+        this.householdResolver = householdResolver;
+    }
+
+    @GetMapping
+    public ResponseEntity<ApiResponse<List<RecipeSummaryResponse>>> listRecipes(
+            Principal principal,
+            @RequestParam(required = false) String search,
+            @RequestParam(required = false) String effort,
+            @RequestParam(required = false) Boolean isChildFriendly,
+            @RequestParam(name = "cookTimeMin.lte", required = false) Integer cookTimeMaxMin,
+            @RequestParam(required = false) String sort,
+            @RequestParam(defaultValue = "20") int limit,
+            @RequestParam(defaultValue = "0") int offset) {
+
+        UUID householdId = householdResolver.resolve(principal.getName());
+        List<RecipeSummaryResponse> recipes = recipeService.listRecipes(
+                householdId, search, effort, isChildFriendly, cookTimeMaxMin, sort, limit, offset);
+        long total = recipeService.countRecipes(
+                householdId, search, effort, isChildFriendly, cookTimeMaxMin);
+
+        var pagination = new ApiResponse.Pagination(total, limit, offset, offset + limit < total);
+        var meta = new ApiResponse.Meta(pagination);
+        return ResponseEntity.ok(ApiResponse.success(recipes, meta));
+    }
+
+    @GetMapping("/{id}")
+    public RecipeDetailResponse getRecipe(Principal principal, @PathVariable UUID id) {
+        UUID householdId = householdResolver.resolve(principal.getName());
+        return recipeService.getRecipe(householdId, id);
+    }
+
+    @PostMapping
+    public ResponseEntity<RecipeDetailResponse> createRecipe(
+            Principal principal,
+            @Valid @RequestBody RecipeCreateRequest request) {
+        UUID householdId = householdResolver.resolve(principal.getName());
+        RecipeDetailResponse detail = recipeService.createRecipe(householdId, request);
+        return ResponseEntity.created(URI.create("/v1/recipes/" + detail.id())).body(detail);
+    }
+
+    @PutMapping("/{id}")
+    public RecipeDetailResponse updateRecipe(
+            Principal principal,
+            @PathVariable UUID id,
+            @Valid @RequestBody RecipeCreateRequest request) {
+        UUID householdId = householdResolver.resolve(principal.getName());
+        return recipeService.updateRecipe(householdId, id, request);
+    }
+
+    @DeleteMapping("/{id}")
+    @ResponseStatus(HttpStatus.NO_CONTENT)
+    public void deleteRecipe(Principal principal, @PathVariable UUID id) {
+        UUID householdId = householdResolver.resolve(principal.getName());
+        recipeService.deleteRecipe(householdId, id);
+    }
+}