fix(search): filter forum/magazin/listing URLs from web search results

Blocks common non-recipe paths like /forum/, /magazin/, /suche/, /themen/,
Chefkoch's /rs/s\d+/ search URLs and /Rezepte.html listings.

Before: 'ravioli' search returned forum threads and listing pages that
triggered 'No schema.org/Recipe JSON-LD' on preview.
After: only real recipe URLs pass through.

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

src/lib/server/search/searxng.ts

@@ -30,6 +30,53 @@ function hostnameFromUrl(url: string): string | null {
   }
 }
 
+// Paths that are clearly NOT a single recipe page on common domains.
+// Broad enough to cover forum/magazine/listing URLs we've seen in the wild
+// across chefkoch.de, emmikochteinfach.de, experimente-aus-meiner-kueche.de etc.
+const NON_RECIPE_PATH_PATTERNS: RegExp[] = [
+  /\/forum\//i,
+  /\/magazin\//i,
+  /\/magazine\//i,
+  /\/suche($|\/|\?)/i,
+  /\/search($|\/|\?)/i,
+  /\/benutzer\//i,
+  /\/profil\//i,
+  /\/autoren\//i,
+  /\/themen\//i,
+  /\/kategorie\//i,
+  /\/kategorien\//i,
+  /\/cook-and-style\//i,
+  /\/tag\//i,
+  /\/rezepte\/?$/i, // "/rezepte/" listing root
+  /\/rezepte\/kategorien/i,
+  /\/rezepte\/was-kocht/i,
+  /\/gewinnspiel/i,
+  /\/impressum/i,
+  /\/datenschutz/i,
+  /\/ueber-(uns|mich)/i,
+  // Chefkoch-specific search-/listing-URLs
+  /\/rs\/s\d+\//i,
+  /\/rs\/s\d+$/i,
+  /Rezepte\.html/i // /rs/.../Rezepte.html is a listing
+];
+
+function looksLikeRecipePage(url: string): boolean {
+  try {
+    const u = new URL(url);
+    const path = u.pathname + u.search;
+    for (const rx of NON_RECIPE_PATH_PATTERNS) {
+      if (rx.test(path)) return false;
+    }
+    // Heuristic: very short paths (just "/" or "/xyz") on non-blog sites
+    // are usually landing pages. Allow when at least one path segment exists
+    // AND path isn't just the root or a single top-level category keyword.
+    if (path === '/' || path === '') return false;
+    return true;
+  } catch {
+    return false;
+  }
+}
+
 export async function searchWeb(
   db: Database.Database,
   query: string,
@@ -63,6 +110,7 @@ export async function searchWeb(
   for (const r of results) {
     const host = hostnameFromUrl(r.url);
     if (!host || !allowed.has(host)) continue;
+    if (!looksLikeRecipePage(r.url)) continue;
     if (seen.has(r.url)) continue;
     seen.add(r.url);
     hits.push({

tests/integration/searxng.test.ts

@@ -71,4 +71,20 @@ describe('searchWeb', () => {
     const hits = await searchWeb(db, '   ', { searxngUrl: baseUrl });
     expect(hits).toEqual([]);
   });
+
+  it('filters out forum/magazine/listing URLs', async () => {
+    const db = openInMemoryForTest();
+    addDomain(db, 'chefkoch.de');
+    respondWith([
+      { url: 'https://www.chefkoch.de/rezepte/123/Ravioli.html', title: 'Ravioli' },
+      { url: 'https://www.chefkoch.de/forum/2,17,89865/ravioli.html', title: 'Forum Ravioli' },
+      { url: 'https://www.chefkoch.de/magazin/artikel/x.html', title: 'Magazin' },
+      { url: 'https://www.chefkoch.de/suche/ravioli', title: 'Suche' },
+      { url: 'https://www.chefkoch.de/themen/ravioli/', title: 'Themen' },
+      { url: 'https://www.chefkoch.de/rezepte/', title: 'Rezepte Übersicht' }
+    ]);
+    const hits = await searchWeb(db, 'ravioli', { searxngUrl: baseUrl });
+    expect(hits.length).toBe(1);
+    expect(hits[0].title).toBe('Ravioli');
+  });
 });