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/api/v1/dashboard.py

@@ -4,6 +4,7 @@ from sqlalchemy import func, select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.deps import get_cra_site_scope, get_current_user, get_db_session, require_study_member
+from app.core.project_permissions import role_has_project_permission
 from app.crud import member as member_crud
 from app.models.milestone import Milestone
 from app.schemas.progress import StudyProgressRead
@@ -74,12 +75,15 @@ async def get_center_summary(
     current_user=Depends(get_current_user),
 ) -> list[CenterSummaryItem]:
     role_value = _role_value(current_user)
-    member_role = None
+    membership = None
     if role_value != "ADMIN":
         membership = await member_crud.get_member(db, study_id, current_user.id)
-        member_role = membership.role_in_study if membership and membership.is_active else None
-    if role_value != "ADMIN" and member_role not in {"PM", "CRA"}:
-        return []
+        if not membership or not membership.is_active:
+            return []
+        can_read_sites = await role_has_project_permission(db, study_id, membership.role_in_study, "sites", "read")
+        can_read_subjects = await role_has_project_permission(db, study_id, membership.role_in_study, "subjects", "read")
+        if not (can_read_sites or can_read_subjects):
+            return []
     cra_scope = await get_cra_site_scope(db, study_id, current_user)
     scope_ids = cra_scope[0] if cra_scope else None
     scope_id_strs = {str(cid) for cid in scope_ids} if scope_ids is not None else None