Add business type, location and logo to the structured data

Three optional settings extend LocalBusiness: a subtype from a fixed list, coordinates as a pair, and a logo from the media library. Without them the output stays as it was, and stored settings need no migration.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

public/assets/admin.css

@@ -843,6 +843,7 @@ details.card > summary:hover { background: #fafbf8 }
 .favicon-current{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--muted)}
 .favicon-actions{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
 .favicon-preview{border-radius:6px;background:#fff;box-shadow:0 0 0 1px rgba(0,0,0,.12)}
+.logo-preview{object-fit:contain}
 .favicon-editor{display:grid;grid-template-columns:minmax(0,1fr) 220px;gap:20px;align-items:start;margin-top:14px}
 .favicon-editor[hidden]{display:none}
 .favicon-stage{position:relative;justify-self:start;max-width:100%;line-height:0;background:repeating-conic-gradient(#eef1eb 0% 25%,#fff 0% 50%) 0 0/16px 16px;user-select:none;touch-action:none}

public/assets/logo-field.js

@@ -0,0 +1,41 @@
+import { openMedia } from './media.js';
+
+/*
+ * The logo for the structured data: one image from the media library, shown as a small preview.
+ * It is saved with the form, like every other value on this screen.
+ */
+const field = document.querySelector('[data-logo-field]');
+if (field) {
+  const input = field.querySelector('[name="organisationLogoMediaId"]');
+  const current = field.querySelector('.favicon-current');
+  const choose = field.querySelector('[data-logo-choose]');
+  const remove = field.querySelector('[data-logo-remove]');
+
+  const show = (label, src = '') => {
+    current.replaceChildren();
+    if (src) {
+      const image = new Image(64, 64);
+      image.className = 'favicon-preview logo-preview';
+      image.alt = '';
+      image.src = src;
+      current.append(image);
+    }
+    const text = document.createElement('span');
+    text.textContent = label;
+    current.append(text);
+    choose.textContent = input.value ? 'Anderes Bild wählen' : 'Bild wählen oder hochladen';
+    remove.hidden = !input.value;
+  };
+
+  choose.addEventListener('click', () => openMedia({ needsAlt: false, onChoose: items => {
+    if (!items.length) return;
+    input.value = items[0].id;
+    show(`„${items[0].title}“ – wird beim Speichern übernommen.`, items[0].variants[0].src);
+    choose.focus();
+  } }));
+  remove.addEventListener('click', () => {
+    input.value = '';
+    show('Kein Logo gewählt – wird beim Speichern übernommen.');
+    choose.focus();
+  });
+}