docs: update README, API reference, dev-log, project structure with Agent monitoring + quick-alarm + latest fixes

- README.md: React 19, default pwd 123456, Docker Compose deploy, correct module list
- api-reference.md: add Agent monitoring section (report/latest/rules/quick-setup/alerts/tasks/kline)
- dev-log.md: new entry documenting hostname/IP fix, system collector, offline detection, quick alarm
- project-structure.md: add agent/ directory, dev-log.md link, React 19

frontend/src/services/api.ts

@@ -499,6 +499,7 @@ export const agentApi = {
   createRule: (data: any) => http.post('/agent/rules', data),
   updateRule: (id: number, data: any) => http.put(`/agent/rules/${id}`, data),
   deleteRule: (id: number) => http.delete(`/agent/rules/${id}`),
+  quickSetup: (type?: string) => http.post('/agent/rules/quick-setup', { type: type || 'ecs' }),
   listAlerts: (params?: Record<string, string>) => http.get('/agent/alerts', params),
   resolveAlert: (id: number) => http.post(`/agent/alerts/${id}/resolve`),
 };
@@ -646,6 +647,16 @@ export const alertCenterApi = {
   toggleRule: async (id: number | string) => {
     return http.post(`/alerts/rules/${id}/toggle`);
   },
+  createRule: async (data: any) => {
+    return http.post('/alerts/rules', data);
+  },
+  deleteRule: async (id: number | string) => {
+    return http.delete(`/alerts/rules/${id}`);
+  },
+  // 一键报警 — 后端批量创建默认规则
+  quickSetup: async (type: string = 'ecs') => {
+    return http.post('/alerts/quick-setup', { type });
+  },
 };
 
 // ==================== 站点拨测 API ====================