权限管理：接入项目级权限矩阵

新增项目级角色权限矩阵，覆盖 PM、CRA、PV、IMP、QA 等项目角色，并通过迁移表持久化各业务模块的读写权限。

后端将参与者、合同费用、物资、启动、里程碑、风险问题、监查稽查、FAQ、共享库、文件版本等接口接入矩阵校验，修复审计日志导出权限和登录 502 的依赖导入问题。

前端新增权限管理页面和项目路由权限映射，按矩阵控制导航显示、直接访问拦截、操作按钮启停，并限制管理后台仅 admin 和授权 PM 可进入。

补充后端权限归一化与接口静态测试、前端路由/权限工具/权限管理页面/工作台等回归测试。

backend/app/services/document_service.py

@@ -11,8 +11,8 @@ from fastapi.responses import FileResponse
 from sqlalchemy import delete as sa_delete, or_, select, update as sa_update
 from sqlalchemy.ext.asyncio import AsyncSession
 
-from app.core import rbac
 from app.core.deps import get_cra_site_scope
+from app.core.project_permissions import role_has_project_permission
 from app.crud import acknowledgement as acknowledgement_crud
 from app.crud import distribution as distribution_crud
 from app.crud import document as document_crud
@@ -75,7 +75,10 @@ async def _ensure_study_access(db: AsyncSession, trial_id: uuid.UUID, current_us
     membership = await member_crud.get_member(db, trial_id, current_user.id)
     if not membership or not membership.is_active:
         raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="不是项目成员")
-    if not rbac.is_allowed(action, current_user, membership):
+    module = "file_versions"
+    permission_action = "read" if action in {"view", "ack"} else "write"
+    allowed = await role_has_project_permission(db, trial_id, membership.role_in_study, module, permission_action)
+    if not allowed:
         raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="权限不足")
     return membership