refactor(auth): remove dead MenuTypeEnum, unify node type vocabulary to MenuType (ADR-0011)

MenuTypeEnum (DIR/MENU/BUTTON) duplicated MenuType (CATALOG/MENU/BUTTON) with
no callers. Removing it eliminates the DIR-vs-CATALOG domain vocabulary split
and leaves a single source of truth for node type rules (isLegalChild etc.).

crm-auth/src/main/java/com/crm/auth/domain/enums/MenuTypeEnum.java

@@ -1,16 +0,0 @@
-package com.crm.auth.domain.enums;
-
-import com.crm.base.domain.enums.HasValueEnum;
-import lombok.Getter;
-import lombok.RequiredArgsConstructor;
-
-@Getter
-@RequiredArgsConstructor
-public enum MenuTypeEnum implements HasValueEnum<Integer> {
-    DIR(1, "目录"),
-    MENU(2, "菜单"),
-    BUTTON(3, "按钮");
-
-    private final Integer value;
-    private final String label;
-}