feat: implement Marco's customer changes

- Remove 'Flotte ansehen' button from hero section
- Remove '24/7 Support' stat from hero section
- Remove 'Unsere Flotte' eyebrow from fleet section
- Remove ALL 'Warum wir' / 'Why us' references from nav links, i18n keys, and legal pages
- Update reviews: Ferrari references only (removed GT3 mentions)
- Update Impressum with correct company data (MC Cars GmbH)
- Add multi-photo gallery: DB migration (17-vehicle-photos.sql), admin UI for photo management, frontend carousel on cards and dialog
- Update SEO: Ferrari-focused meta tags, title, keywords, JSON-LD
- Clean up dead i18n keys (viewFleet, statSupport, fleetEyebrow, navWhy, why* keys)
- Fix legal page issues: add config.js script, fix logo references to SVG
- Add Playwright E2E tests (26/26 passing)
- Update footer tagline across all pages

frontend/styles.css

@@ -420,6 +420,146 @@ select:focus, input:focus, textarea:focus {
     box-shadow: 0 4px 12px rgba(0,0,0,0.5);
 }
 
+/* Photo carousel nav */
+.vehicle-photo-nav {
+    position: absolute;
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    padding: 0.5rem;
+    opacity: 0;
+    transition: opacity 0.3s ease;
+    pointer-events: none;
+}
+.vehicle-photo:hover .vehicle-photo-nav {
+    opacity: 1;
+    pointer-events: auto;
+}
+.vehicle-photo-prev,
+.vehicle-photo-next {
+    background: rgba(0,0,0,0.6);
+    color: #fff;
+    border: none;
+    border-radius: 50%;
+    width: 32px;
+    height: 32px;
+    font-size: 1.2rem;
+    cursor: pointer;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    transition: background 0.2s ease;
+}
+.vehicle-photo-prev:hover,
+.vehicle-photo-next:hover {
+    background: rgba(0,0,0,0.8);
+}
+.vehicle-photo-dots {
+    position: absolute;
+    bottom: 0.6rem;
+    left: 50%;
+    transform: translateX(-50%);
+    display: flex;
+    gap: 6px;
+}
+.vehicle-photo-dots span {
+    width: 8px;
+    height: 8px;
+    border-radius: 50%;
+    background: rgba(255,255,255,0.4);
+    transition: background 0.2s ease, transform 0.2s ease;
+}
+.vehicle-photo-dots span.active {
+    background: #fff;
+    transform: scale(1.3);
+}
+
+/* Dialog gallery */
+.dialog-gallery {
+    position: relative;
+    width: 100%;
+    aspect-ratio: 16/10;
+    background: #0e1015;
+    border-radius: var(--radius);
+    overflow: hidden;
+    margin-bottom: 1.2rem;
+}
+.dialog-gallery-main {
+    width: 100%;
+    height: 100%;
+    object-fit: cover;
+    display: block;
+}
+.dialog-gallery-nav {
+    position: absolute;
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    padding: 0.5rem;
+    pointer-events: none;
+}
+.dialog-gallery-prev,
+.dialog-gallery-next {
+    background: rgba(0,0,0,0.6);
+    color: #fff;
+    border: none;
+    border-radius: 50%;
+    width: 36px;
+    height: 36px;
+    font-size: 1.4rem;
+    cursor: pointer;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    transition: background 0.2s ease;
+    pointer-events: auto;
+}
+.dialog-gallery-prev:hover,
+.dialog-gallery-next:hover {
+    background: rgba(0,0,0,0.8);
+}
+.dialog-gallery-thumbs {
+    position: absolute;
+    bottom: 0.6rem;
+    left: 50%;
+    transform: translateX(-50%);
+    display: flex;
+    gap: 6px;
+}
+.dialog-gallery-thumbs button {
+    width: 56px;
+    height: 36px;
+    border-radius: 6px;
+    overflow: hidden;
+    border: 2px solid transparent;
+    cursor: pointer;
+    opacity: 0.6;
+    transition: opacity 0.2s ease, border-color 0.2s ease;
+    padding: 0;
+    background: none;
+}
+.dialog-gallery-thumbs button.active {
+    border-color: #fff;
+    opacity: 1;
+}
+.dialog-gallery-thumbs button:hover {
+    opacity: 0.9;
+}
+.dialog-gallery-thumbs button img {
+    width: 100%;
+    height: 100%;
+    object-fit: cover;
+    display: block;
+}
+
 .vehicle-body {
     padding: 1.4rem;
     display: flex;