1、优化导航图标折叠不对齐

2、优化登陆页面footer文字颜色，符合主题切换
3、优化部门、菜单列表滚动条最小高度

frontend/src/views/system/auth/login.vue

@@ -311,7 +311,6 @@ onMounted(() => {
 
 <style lang="scss" scoped>
 .ant-btn-link {
-  color: rgba(0, 0, 0, 0.65);
   margin-inline-end: 8px;
   padding: 0;
 }

frontend/src/views/system/dept/index.vue

@@ -63,7 +63,7 @@
           :columns="columns"
           :data-source="dataSource"
           :loading="tableLoading"
-          :scroll="{ x: 500, y: 'calc(100vh - 300px)' }"
+          :scroll="{ x: 500, y: 'calc(100vh - 450px)' }"
           :row-selection="rowSelection"
           :pagination="false"
           :style="{ minHeight: '420px' }"

frontend/src/views/system/menu/index.vue

@@ -63,7 +63,7 @@
           :columns="columns" 
           :data-source="dataSource"
           :loading="tableLoading" 
-          :scroll="{ x: 500, y: 'calc(100vh - 300px)' }"
+          :scroll="{ x: 500, y: 'calc(100vh - 450px)' }"
           :row-selection="rowSelection" 
           :pagination="false" 
           :style="{ minHeight: '420px' }"