diff --git a/app/api/endpoints/dashboard.py b/app/api/endpoints/dashboard.py
index b233d0de0..91a8fae4b 100644
--- a/app/api/endpoints/dashboard.py
+++ b/app/api/endpoints/dashboard.py
@@ -69,8 +69,8 @@ def _build_storage() -> schemas.Storage:
         _result = StorageChain().manage_storage(storage=_storage, action=StorageAction.USAGE.value)
         _usage = _result.get("data") if _result.get("success") else None
         if _usage:
-            total += _usage.total
-            available += _usage.available
+            total += _usage.get("total") or 0
+            available += _usage.get("available") or 0
     return schemas.Storage(total_storage=total, used_storage=total - available)
 
 
diff --git a/app/modules/filemanager/__init__.py b/app/modules/filemanager/__init__.py
index 895d30298..1a26a0cf9 100644
--- a/app/modules/filemanager/__init__.py
+++ b/app/modules/filemanager/__init__.py
@@ -13,7 +13,7 @@ from app.runtime.log import logger
 from app.modules import _ModuleBase
 from app.modules.filemanager.storages import StorageBase
 from app.modules.filemanager.transhandler import TransHandler
-from app.schemas import TransferInfo, ExistMediaInfo, TmdbEpisode, TransferDirectoryConf, FileItem
+from app.schemas import TransferInfo, ExistMediaInfo, TmdbEpisode, TransferDirectoryConf, FileItem, StorageUsage
 from app.schemas.types import MUSIC_ENTITY_ALBUM, MediaType, ModuleType, OtherModulesType, StorageAction
 from app.adapters.system.host import SystemUtils
 from app.foundation import text as text_tools
@@ -152,14 +152,14 @@ class FileManagerModule(_ModuleBase):
             storage_oper = self.__get_storage_oper(storage)
             if not storage_oper:
                 return {"success": False, "message": f"不支持 {storage} 的整理方式获取"}
-            transtype = storage_oper.support_transtype()
-            return {"success": bool(transtype), "data": transtype}
+            # 与旧契约一致：返回值包装为 transtype，空结果同样返回成功空结构
+            return {"success": True, "data": {"transtype": storage_oper.support_transtype() or {}}}
         if action == StorageAction.USAGE:
             storage_oper = self.__get_storage_oper(storage)
             if not storage_oper:
                 return {"success": False, "message": f"不支持 {storage} 的存储使用情况"}
-            usage = storage_oper.usage()
-            return {"success": bool(usage), "data": usage}
+            # 实现返回 pydantic 模型，转为 dict 后才能透过通用响应的开放映射校验
+            return {"success": True, "data": (storage_oper.usage() or StorageUsage()).model_dump()}
 
         # 登录类动作：存储实现不支持时返回失败信息
         oper_method = action.value
diff --git a/tests/test_storage_manage.py b/tests/test_storage_manage.py
index d804e4deb..aaeb481bc 100644
--- a/tests/test_storage_manage.py
+++ b/tests/test_storage_manage.py
@@ -7,6 +7,7 @@
 3. 端点层的 ManageRequest 通用请求结构：target + action + params
 """
 from types import SimpleNamespace
+from typing import Any, Dict
 
 import pytest
 
@@ -105,18 +106,46 @@ def test_storage_manage_save_config_passes_conf_through(module):
 
 
 def test_storage_manage_usage_returns_oper_data(module):
-    """usage 动作返回存储实现的用量数据。"""
+    """usage 动作返回纯 dict 用量数据，空结果同样成功。"""
     result = module.storage_manage(storage="fakestore", action="usage")
     assert result["success"] is True
-    assert result["data"].total == 100
-    assert result["data"].available == 40
+    assert result["data"] == {"total": 100.0, "available": 40.0}
+
+
+def test_storage_manage_usage_data_passes_open_mapping_response(module):
+    """用量数据必须能透过通用响应 Response[Dict[str, Any]] 的开放映射校验。
+
+    回归守护：存储实现返回 pydantic 模型时若未转 dict，
+    端点响应校验会直接 500，前端存储页整体报未知错误。
+    """
+    result = module.storage_manage(storage="fakestore", action="usage")
+    response = schemas.Response[Dict[str, Any]](
+        success=result["success"], message=result.get("message"), data=result["data"]
+    )
+    assert response.data == {"total": 100.0, "available": 40.0}
+
+
+def test_storage_manage_usage_defaults_when_oper_returns_none(module, monkeypatch):
+    """存储实现查不到用量时返回成功的默认空结构而非业务失败。"""
+    monkeypatch.setattr(_FakeStorageOper, "usage", lambda self: None)
+    result = module.storage_manage(storage="fakestore", action="usage")
+    assert result["success"] is True
+    assert result["data"] == {"total": 0.0, "available": 0.0}
 
 
 def test_storage_manage_support_transtype(module):
-    """support_transtype 动作返回存储支持的整理方式。"""
+    """support_transtype 动作返回值包装为 transtype，与旧契约结构一致。"""
     result = module.storage_manage(storage="fakestore", action="support_transtype")
     assert result["success"] is True
-    assert result["data"] == {"move": True}
+    assert result["data"] == {"transtype": {"move": True}}
+
+
+def test_storage_manage_support_transtype_empty_still_succeeds(module, monkeypatch):
+    """存储不支持任何整理方式时返回成功空结构，避免前端把空结果当业务失败。"""
+    monkeypatch.setattr(_FakeStorageOper, "support_transtype", lambda self: {})
+    result = module.storage_manage(storage="fakestore", action="support_transtype")
+    assert result["success"] is True
+    assert result["data"] == {"transtype": {}}
 
 
 def test_storage_manage_login_action_forwards_params(module):