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/lib/api.ts

@@ -16,6 +16,13 @@ interface OfferRecord {
   cuda_version?: string;
   price_per_hour?: number;
   region?: string;
+  attributes?: {
+    ollama_host?: string;
+    models?: string[];
+    vram_mb?: number;
+    driver?: string;
+    [key: string]: unknown;
+  };
 }
 
 interface OffersResponse {