feat(search): add SearXNG client with whitelist-filtered web search

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

src/routes/api/recipes/search/web/+server.ts

@@ -0,0 +1,15 @@
+import type { RequestHandler } from './$types';
+import { json, error } from '@sveltejs/kit';
+import { getDb } from '$lib/server/db';
+import { searchWeb } from '$lib/server/search/searxng';
+
+export const GET: RequestHandler = async ({ url }) => {
+  const q = url.searchParams.get('q')?.trim() ?? '';
+  if (!q) error(400, { message: 'Missing ?q=' });
+  try {
+    const hits = await searchWeb(getDb(), q);
+    return json({ query: q, hits });
+  } catch (e) {
+    error(502, { message: `Web search unavailable: ${(e as Error).message}` });
+  }
+};