中文：收口权限与中心/立项配置改造

backend/tests/test_project_management_permissions_static.py

@@ -0,0 +1,16 @@
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[1]
+
+
+def test_project_management_write_routes_allow_project_admin_and_pm():
+    for relative_path in (
+        "app/api/v1/studies.py",
+        "app/api/v1/sites.py",
+        "app/api/v1/members.py",
+    ):
+        source = (ROOT / relative_path).read_text(encoding="utf-8")
+
+        assert 'require_study_roles(["PM"])' not in source
+        assert 'require_study_roles(["ADMIN", "PM"])' in source