Add dataset bench and validation agents

backend/app/catalog.py

@@ -103,6 +103,11 @@ def discover_datasets() -> list[dict[str, Any]]:
         if item.name == "All_Data_Record.json" or not data:
             continue
         candidates.append({"name": item.stem, "path": rel(item, root), "source": "mmseg_parameter"})
+    uploaded_root = settings.project_root / "var" / "uploads" / "datasets"
+    if uploaded_root.exists():
+        for item in sorted(uploaded_root.iterdir()):
+            if item.is_dir():
+                candidates.append({"name": item.name, "path": rel(item, settings.project_root), "source": "uploaded"})
     return candidates
 
 
@@ -137,4 +142,3 @@ def get_catalog() -> dict[str, Any]:
         "datasets": discover_datasets(),
         "weights": discover_weights_summary(),
     }
-