Add monitoring service and database schema

- Implement monitoring service with heartbeat, lease tasks, resume tasks, and task result handling.
- Create monitoring time utilities for business date calculations.
- Add unit tests for date window resolution and business day handling.
- Define database schema for monitoring-related tables including quotas, daily reports, and task management.
- Establish migration scripts for creating and dropping monitoring tables.

apps/admin-web/src/components/MarkdownPreview.vue

@@ -1,4 +1,5 @@
 <script setup lang="ts">
+import DOMPurify from "dompurify";
 import MarkdownIt from "markdown-it";
 import { computed } from "vue";
 
@@ -12,7 +13,10 @@ const renderer = new MarkdownIt({
   breaks: true,
 });
 
-const html = computed(() => renderer.render(props.content || ""));
+const html = computed(() => {
+  const rawHtml = renderer.render(props.content || "");
+  return DOMPurify.sanitize(rawHtml);
+});
 </script>
 
 <template>

apps/admin-web/src/components/PageHero.vue

@@ -28,13 +28,13 @@ withDefaults(
 <style scoped>
 .page-hero {
   display: flex;
-  align-items: flex-start;
+  align-items: center;
   justify-content: space-between;
   gap: 24px;
-  padding: 28px 30px;
-  background: linear-gradient(135deg, #ffffff 0%, #f7fbff 100%);
-  border: 1px solid #e6edf5;
-  border-radius: 24px;
+  padding: 24px;
+  background: #ffffff;
+  border: 1px solid #f0f3fa;
+  border-radius: 12px;
 }
 
 .page-hero__copy {
@@ -52,8 +52,9 @@ withDefaults(
 
 .page-hero h1 {
   margin: 0;
-  font-size: 30px;
-  line-height: 1.08;
+  font-size: 24px;
+  font-weight: 700;
+  line-height: 1.2;
 }
 
 .page-hero p:last-child {