feat：增加 DocAlert 文档说明

apps/web-antd/src/components/doc-alert/index.ts

@@ -0,0 +1,3 @@
+import DocAlert from './src/DocAlert.vue'
+
+export { DocAlert }

apps/web-antd/src/components/doc-alert/src/DocAlert.vue

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+<script lang="ts" setup>
+import { computed } from 'vue';
+import { Alert, Typography } from 'ant-design-vue';
+
+export interface DocAlertProps {
+  /**
+   * 文档标题
+   */
+  title: string;
+  /**
+   * 文档 URL 地址
+   */
+  url: string;
+}
+
+const props = defineProps<DocAlertProps>();
+
+/** 跳转 URL 链接 */
+const goToUrl = () => {
+  window.open(props.url);
+};
+
+/** 是否开启 */
+const isEnabled = computed(() => {
+  return import.meta.env.VITE_APP_DOCALERT_ENABLE !== 'false';
+});
+</script>
+
+<template>
+  <Alert
+    v-if="isEnabled"
+    type="info"
+    show-icon
+    class="mb-2 rounded"
+  >
+    <template #message>
+      <Typography.Link @click="goToUrl">
+        【{{ title }}】文档地址：{{ url }}
+      </Typography.Link>
+    </template>
+  </Alert>
+</template>