feat(multimodal): 补齐阶段F运行管理与收尾验收

backend/app/local_models/manager.py

@@ -49,8 +49,20 @@ def task_key(key):
     return str(model_path(key)), key
 
 
+def disk_bytes(key):
+    total = 0
+    try:
+        root = model_path(key).resolve()
+        for path in root.rglob("*"):
+            if not path.is_symlink() and path.is_file() and path.resolve().is_relative_to(root):
+                total += path.stat().st_size
+    except OSError:
+        return None
+    return total
+
+
 def describe():
-    return {"items": [{**spec.public(), **read_state(key)} for key, spec in CATALOG.items()]}
+    return {"items": [{**spec.public(), **read_state(key), "disk_bytes": disk_bytes(key)} for key, spec in CATALOG.items()]}
 
 
 async def download(key):