feat: show Ollama plugin badge and available LLM models on marketplace cards

Backend:
- Add attributes field to MarketplaceOfferView schema
- Include attributes in _to_offer_view() response

Frontend:
- Add attributes type with Ollama fields to OfferRecord
- Show purple 'Ollama' plugin badge on cards with models
- Display available LLM model tags (gemma3, deepseek-r1, etc.)
- Add plugin-badge and model-tag CSS styles

apps/marketplace-web/src/style.css

@@ -203,6 +203,54 @@ body {
   color: #64748b;
 }
 
+.offer-plugins {
+  margin-bottom: 8px;
+}
+
+.plugin-badge {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  padding: 3px 10px;
+  border-radius: 999px;
+  font-size: 0.75rem;
+  font-weight: 700;
+  text-transform: uppercase;
+  letter-spacing: 0.04em;
+  background: linear-gradient(135deg, #6366f1, #8b5cf6);
+  color: #ffffff;
+}
+
+.offer-models {
+  margin-bottom: 16px;
+}
+
+.models-label {
+  display: block;
+  font-size: 0.7rem;
+  text-transform: uppercase;
+  letter-spacing: 0.06em;
+  color: #94a3b8;
+  margin-bottom: 8px;
+}
+
+.model-tags {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 6px;
+}
+
+.model-tag {
+  display: inline-block;
+  padding: 3px 10px;
+  border-radius: 8px;
+  font-size: 0.78rem;
+  font-weight: 500;
+  background: #f1f5f9;
+  color: #334155;
+  border: 1px solid #e2e8f0;
+}
+
 .status-pill {
   display: inline-flex;
   align-items: center;