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}