feat: 平台治理与权限体系完善，存储进度/GPU预留/审批中心与日志整合

- 平台治理: 租户用户权限层次、资源ACL、审批中心与审批模板、访问申请
- 存储: MinIO 存储进度迁移、对象存储安全加固与测试
- 计算: GPU 资源预留、compute 轮询与同步增强
- 权限: permission v2 迁移、权限安全验收测试
- 日志: 后端运行日志中文说明、操作日志整合
- 数据处理/评测: 数据转换与模型评测优化

Co-Authored-By: Claude <noreply@anthropic.com>

backend/tests/test_storage_security.py

@@ -0,0 +1,26 @@
+from __future__ import annotations
+
+import pytest
+
+from app.api.v1.endpoints.platform import _validate_storage_key
+
+
+def test_storage_key_is_scoped_to_resource_version() -> None:
+    assert (
+        _validate_storage_key("dataset", "ds_123", "v1", None, "train.jsonl")
+        == "datasets/ds_123/versions/v1/train.jsonl"
+    )
+
+
+@pytest.mark.parametrize(
+    "object_key",
+    [
+        "models/other/versions/v1/model.bin",
+        "datasets/ds_123/versions/v1/../secret.bin",
+        "datasets/ds_123/versions/v1/../../secret.bin",
+        "/datasets/ds_123/versions/v1/model.bin",
+    ],
+)
+def test_storage_key_rejects_escape_or_cross_resource_paths(object_key: str) -> None:
+    with pytest.raises(ValueError):
+        _validate_storage_key("dataset", "ds_123", "v1", object_key, None)