performance: Caching, deferred Tracking & externe Timeouts (H7, M12, M13)

- Navigations-Chrome (CategoryNavigation), Suche- und Newsroom-Seitendaten
  300s gecacht; gemeinsamer WebPageCache-Helper (eine TTL/Key-Konvention).
- Cache-Poisoning über ?page= geschlossen (Key an Paginator ausgerichtet,
  kein withQueryString im Cache); Newsrooms cachet nur den ungefilterten
  Fall und die ersten Seiten (kein unbegrenzter Key-Raum).
- Detailseiten schreiben Hits/View-Events deferred nach der Response
  (M12); OpenAI-/Markt-/USt-ID-Aufrufe mit Connect-Timeouts und
  begrenzten Retries; Admin-Memo-Caches konsistent invalidiert.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/Feature/Web/PageDataCacheTest.php

@@ -94,6 +94,117 @@ test('category page data is cached per portal, language and slug but 404s are no
     expect(Cache::has('web.category.businessportal24.de.gibt-es-nicht'))->toBeFalse();
 });
 
+test('search sidebar data is cached per portal and language', function () {
+    /** @var TestCase $this */
+    $this->get('https://businessportal24.test/de/suche')->assertSuccessful();
+
+    expect(Cache::has('web.search.most-read.businessportal24-both.de'))->toBeTrue();
+});
+
+test('newsroom detail data is cached per portal language slug and page', function () {
+    /** @var TestCase $this */
+    $company = Company::factory()->businessportal24()->create([
+        'slug' => 'cache-newsroom',
+        'is_active' => true,
+    ]);
+    PressRelease::factory()
+        ->published()
+        ->forPortal(Portal::Businessportal24)
+        ->create([
+            'company_id' => $company->id,
+            'language' => 'de',
+            'published_at' => now()->subDay(),
+        ]);
+
+    $this->get('https://businessportal24.test/de/newsroom/cache-newsroom?page=2')
+        ->assertSuccessful();
+
+    expect(Cache::has('web.newsroom.businessportal24-both.de.cache-newsroom.page.2'))->toBeTrue();
+});
+
+test('newsroom detail cache key aligns with the paginator so an invalid page cannot poison another page', function () {
+    /** @var TestCase $this */
+    $company = Company::factory()->businessportal24()->create([
+        'slug' => 'poison-newsroom',
+        'is_active' => true,
+    ]);
+    PressRelease::factory()
+        ->published()
+        ->forPortal(Portal::Businessportal24)
+        ->create([
+            'company_id' => $company->id,
+            'language' => 'de',
+            'published_at' => now()->subDay(),
+        ]);
+
+    // Ungültige Seitennummer: der Paginator rendert Seite 1, also darf der
+    // Inhalt NICHT unter dem Key für Seite 2 landen (sonst Cache-Poisoning).
+    $this->get('https://businessportal24.test/de/newsroom/poison-newsroom?page=2.5')
+        ->assertSuccessful();
+
+    expect(Cache::has('web.newsroom.businessportal24-both.de.poison-newsroom.page.1'))->toBeTrue();
+    expect(Cache::has('web.newsroom.businessportal24-both.de.poison-newsroom.page.2'))->toBeFalse();
+});
+
+test('newsrooms unfiltered index is cached but filtered searches are not', function () {
+    /** @var TestCase $this */
+    $company = Company::factory()->businessportal24()->create([
+        'name' => 'SolarTec Bestand',
+        'is_active' => true,
+    ]);
+    PressRelease::factory()
+        ->published()
+        ->forPortal(Portal::Businessportal24)
+        ->for($company)
+        ->create(['language' => 'de', 'published_at' => now()->subDay()]);
+
+    // Ungefiltertes Verzeichnis (erste Seite) wird unter einem beschränkten Key gecacht.
+    $this->get('https://businessportal24.test/de/newsrooms')
+        ->assertSuccessful()
+        ->assertSeeText('SolarTec Bestand');
+
+    expect(Cache::has('web.newsrooms.businessportal24,both.de.page.1'))->toBeTrue();
+
+    // Gefilterte Suche wird NICHT gecacht (Schutz vor unbegrenztem Key-Raum):
+    // eine nach dem ersten Aufruf angelegte Firma erscheint sofort.
+    $newCompany = Company::factory()->businessportal24()->create([
+        'name' => 'SolarTec Neu',
+        'is_active' => true,
+    ]);
+    PressRelease::factory()
+        ->published()
+        ->forPortal(Portal::Businessportal24)
+        ->for($newCompany)
+        ->create(['language' => 'de', 'published_at' => now()->subHour()]);
+
+    $this->get('https://businessportal24.test/de/newsrooms?q=solartec')
+        ->assertSuccessful()
+        ->assertSeeText('SolarTec Neu');
+
+    $this->get('https://businessportal24.test/de/newsrooms?q=solartec')
+        ->assertSuccessful()
+        ->assertSeeText('SolarTec Neu');
+});
+
+test('deep newsrooms pages are not cached', function () {
+    /** @var TestCase $this */
+    $this->get('https://businessportal24.test/de/newsrooms?page=25')->assertSuccessful();
+
+    expect(Cache::has('web.newsrooms.businessportal24,both.de.page.25'))->toBeFalse();
+});
+
+test('newsrooms cache does not retain unrelated query parameters in pagination links', function () {
+    /** @var TestCase $this */
+    $response = $this->get('https://businessportal24.test/de/newsrooms?q=SolarTec&utm_source=poison')
+        ->assertSuccessful();
+
+    $pageTwoUrl = $response->viewData('newsrooms')->url(2);
+
+    expect($pageTwoUrl)
+        ->toContain('q=SolarTec')
+        ->not->toContain('utm_source');
+});
+
 test('subcategory counts are aggregated correctly in a single grouped query', function () {
     /** @var TestCase $this */
     $parent = makeCategoryWithSlug(Portal::Both, 'Wirtschaft', 'wirtschaft');