feat(health): 添加工作台统计和团队概览 API

- ActionInboxService 新增 get_workbench_stats 和 get_team_overview
- Handler 新增 /health/action-inbox/stats 和 /team 端点
- 注册 health.action-inbox.team 权限码

crates/erp-health/src/module.rs

@@ -691,6 +691,14 @@ impl HealthModule {
                 "/health/action-inbox",
                 axum::routing::get(action_inbox_handler::list_action_inbox),
             )
+            .route(
+                "/health/action-inbox/stats",
+                axum::routing::get(action_inbox_handler::get_workbench_stats),
+            )
+            .route(
+                "/health/action-inbox/team",
+                axum::routing::get(action_inbox_handler::get_team_overview),
+            )
             .route(
                 "/health/action-inbox/{source_ref}/thread",
                 axum::routing::get(action_inbox_handler::get_action_thread),
@@ -1074,6 +1082,12 @@ impl ErpModule for HealthModule {
                 description: "审批/拒绝/标记行动收件箱中的事项".into(),
                 module: "health".into(),
             },
+            PermissionDescriptor {
+                code: "health.action-inbox.team".into(),
+                name: "查看团队概览".into(),
+                description: "查看科室团队工作负载和风险分布（主任专属）".into(),
+                module: "health".into(),
+            },
         ]
     }