refactor权限控制逻辑

- 移除全局方法getUserBtnRole
- 使用hasPermission函数替代checkBtnPermission
- 优化权限判断逻辑，减少冗余代码
- 统一权限控制的实现方式

src/addon/erp/pages/product/unit/add.vue

@@ -8,7 +8,7 @@
 				</u-form-item>
 			</view>
 		</u-form>
-		<view class="w-full footer">
+		<view v-if="hasPermission('erp_product_unit_add')" class="w-full footer">
 			<view class="py-[var(--top-m)] px-[var(--sidebar-m)] footer w-full fixed bottom-0 left-0 right-0 box-border">
 				<button hover-class="none" class="!bg-[var(--primary-color)] text-[#fff] h-[80rpx] leading-[80rpx] rounded-[100rpx] text-[26rpx] font-500" 
 				@click="handSave" :disabled="loading" :class="{'opacity-50': loading}">{{t('save')}}</button>
@@ -28,9 +28,9 @@
 	import { onLoad } from '@dcloudio/uni-app';
 	import { getProductUnitInfo, addProductUnit, editProductUnit } from '@/addon/erp/api/product';
 	import { redirect } from '@/utils/common';
-	import { checkBtnPermission } from '@/utils/auth';
 	import useMemberStore from '@/stores/member'
-	
+	import usePermission from '@/utils/usePermission'
+	const { hasPermission } = usePermission()	
 	const memberStore = useMemberStore()
 	
 	const formRef: any = ref(null)
@@ -71,8 +71,6 @@
 	
 	// 保存
 	const handSave = async() => {
-		const hasPermission = await checkBtnPermission(memberStore.btnPermission, 'erp_product_unit_add')
-		if (!hasPermission) return
 		formRef.value.validate().then(() => {
 		    if (loading.value) return
 		    loading.value = true