feat(server): 添加暖记日记管理菜单种子数据 + 图标注册

- 新增迁移 m20260602_000301_diary_menu_seed
- 插入'日记管理'目录菜单 (BookOutlined, sort=50)
- 子菜单: 班级管理/日记审核/主题管理/贴纸管理
- 关联 admin + teacher 角色 (menu_roles)
- 图标注册: BookOutlined, ScheduleOutlined, SmileOutlined

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

@@ -71,6 +71,7 @@ mod m20260531_000182_create_user_settings;
 mod m20260531_000183_diary_indexes_and_fts;
 mod m20260531_000184_diary_seed_data;
 mod m20260601_000300_diary_role_seed;
+mod m20260602_000301_diary_menu_seed;
 
 pub struct Migrator;
 
@@ -148,6 +149,7 @@ impl MigratorTrait for Migrator {
             Box::new(m20260531_000183_diary_indexes_and_fts::Migration),
             Box::new(m20260531_000184_diary_seed_data::Migration),
             Box::new(m20260601_000300_diary_role_seed::Migration),
+            Box::new(m20260602_000301_diary_menu_seed::Migration),
         ]
     }
 }