feat(api): add recipe detail, search, rating, favorite, cooked, comments endpoints

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/routes/api/recipes/[id]/+server.ts

@@ -0,0 +1,47 @@
+import type { RequestHandler } from './$types';
+import { json, error } from '@sveltejs/kit';
+import { z } from 'zod';
+import { getDb } from '$lib/server/db';
+import { deleteRecipe, getRecipeById } from '$lib/server/recipes/repository';
+import {
+  listComments,
+  listCookingLog,
+  listRatings,
+  renameRecipe
+} from '$lib/server/recipes/actions';
+
+const RenameSchema = z.object({ title: z.string().min(1).max(200) });
+
+function parseId(raw: string): number {
+  const id = Number(raw);
+  if (!Number.isInteger(id) || id <= 0) error(400, { message: 'Invalid id' });
+  return id;
+}
+
+export const GET: RequestHandler = async ({ params }) => {
+  const id = parseId(params.id!);
+  const db = getDb();
+  const recipe = getRecipeById(db, id);
+  if (!recipe) error(404, { message: 'Recipe not found' });
+  const ratings = listRatings(db, id);
+  const comments = listComments(db, id);
+  const cooking_log = listCookingLog(db, id);
+  const avg_stars =
+    ratings.length === 0 ? null : ratings.reduce((s, r) => s + r.stars, 0) / ratings.length;
+  return json({ recipe, ratings, comments, cooking_log, avg_stars });
+};
+
+export const PATCH: RequestHandler = async ({ params, request }) => {
+  const id = parseId(params.id!);
+  const body = await request.json().catch(() => null);
+  const parsed = RenameSchema.safeParse(body);
+  if (!parsed.success) error(400, { message: 'Invalid body' });
+  renameRecipe(getDb(), id, parsed.data.title);
+  return json({ ok: true });
+};
+
+export const DELETE: RequestHandler = async ({ params }) => {
+  const id = parseId(params.id!);
+  deleteRecipe(getDb(), id);
+  return json({ ok: true });
+};