feat(db): role_permissions 添加 data_scope 列

行级数据权限基础设施 — role_permissions 表新增 data_scope 列，
支持 all/self/department/department_tree 四种数据范围。

crates/erp-server/migration/src/lib.rs

@@ -35,6 +35,7 @@ mod m20260416_000031_create_domain_events;
 mod m20260417_000033_create_plugins;
 mod m20260417_000034_seed_plugin_permissions;
 mod m20260418_000035_pg_trgm_and_entity_columns;
+mod m20260418_000036_add_data_scope_to_role_permissions;
 
 pub struct Migrator;
 
@@ -77,6 +78,7 @@ impl MigratorTrait for Migrator {
             Box::new(m20260417_000033_create_plugins::Migration),
             Box::new(m20260417_000034_seed_plugin_permissions::Migration),
             Box::new(m20260418_000035_pg_trgm_and_entity_columns::Migration),
+            Box::new(m20260418_000036_add_data_scope_to_role_permissions::Migration),
         ]
     }
 }