feat(agent): enrich_hf_metadata with per-model progress and in-place card update

- PostProcessor returns updates dict from enrich_hf_metadata
- AgentService includes updated_data per model in WebSocket progress events
- Convert preview_url to HTTP URL via config.get_preview_static_url()
- LoraContextMenu: showEnhancedProgress + updateSingleItem per model
- BulkContextMenu: same pattern, remove window.location.reload()
- Guard empty updated_data and clean up callbacks on HTTP error

py/services/agent/post_processor.py

@@ -253,6 +253,7 @@ class PostProcessor:
             "success": True,
             "updated_fields": updated_fields,
             "preview_downloaded": preview_downloaded,
+            "updates": updates,
             "errors": [],
         }