feat: 网络双线图+告警联系人/联系组+Agent v2.0.0 + 一键报警阈值

- HostMonitor: 网络改为双线图 rx/tx 网卡带宽吞吐(双Area线), 移除单rx图
- Agent: 默认版本号从 dev 改为 v2.0.0, 重建二进制 5.2MB
- 告警中心: 新增报警联系人/报警联系组 Tab, ContactDialog/ContactGroupDialog
- 后端: AlertContact/AlertContactGroup 模型+CRUD, monitor_alert_contacts/groups 表
- 路由: /alerts/contacts + /alerts/contact-groups 8个REST端点
- 一键报警: 更新描述为6条规则(含TCP+进程), 切换到 /alerts/quick-setup
- 测试规则: 内存>10% 触发告警已创建, 飞书通知验证通过

frontend/src/services/api.ts

@@ -576,6 +576,32 @@ export const alertApi = {
   testNotifyChannel: async (id: number | string) => {
     return http.post(`/alerts/notify-channels/${id}/test`);
   },
+  // 报警联系人
+  getContacts: async () => {
+    return http.get('/alerts/contacts');
+  },
+  createContact: async (data: any) => {
+    return http.post('/alerts/contacts', data);
+  },
+  updateContact: async (id: number | string, data: any) => {
+    return http.put(`/alerts/contacts/${id}`, data);
+  },
+  deleteContact: async (id: number | string) => {
+    return http.delete(`/alerts/contacts/${id}`);
+  },
+  // 报警联系组
+  getContactGroups: async () => {
+    return http.get('/alerts/contact-groups');
+  },
+  createContactGroup: async (data: any) => {
+    return http.post('/alerts/contact-groups', data);
+  },
+  updateContactGroup: async (id: number | string, data: any) => {
+    return http.put(`/alerts/contact-groups/${id}`, data);
+  },
+  deleteContactGroup: async (id: number | string) => {
+    return http.delete(`/alerts/contact-groups/${id}`);
+  },
 };
 
 // ==================== 流水线 API ====================