fix(intelligence): Heartbeat 统一健康系统 — 6处断链修复 + 健康面板 + SaaS自动恢复

Rust 后端 (heartbeat.rs):
- 告警实时推送: OnceLock<AppHandle> + Tauri emit heartbeat:alert
- 动态间隔: tokio::select! + Notify 替代不可变 interval
- Config 持久化: update_config 写入 VikingStorage
- heartbeat_init 从 VikingStorage 恢复 config
- 移除 dead code (subscribe, HeartbeatCheckFn)
- Memory stats fallback 分层处理

新增 health_snapshot.rs:
- HealthSnapshot Tauri 命令 — 按需查询引擎/记忆状态
- 注册到 lib.rs invoke_handler

前端修复:
- HeartbeatConfig handleSave 同步到 Rust 后端
- App.tsx 读 localStorage 持久化配置 + heartbeat:alert 监听 + toast
- saasStore 降级后指数退避探测恢复 + saas-recovered 事件
- 新增 HealthPanel.tsx 只读健康面板 (4卡片 + 告警列表)
- SettingsLayout 添加 health 导航入口

清理:
- 删除 intelligence-client/ 目录版 (9文件 -1640行, 单文件版是活跃代码)

desktop/src/App.tsx

@@ -21,6 +21,7 @@ import { isTauriRuntime, getLocalGatewayStatus, startLocalGateway } from './lib/
 import { LoginPage } from './components/LoginPage';
 import { useOnboarding } from './lib/use-onboarding';
 import { intelligenceClient } from './lib/intelligence-client';
+import { safeListen } from './lib/safe-tauri';
 import { loadEmbeddingConfig, loadEmbeddingApiKey } from './lib/embedding-client';
 import { invoke } from '@tauri-apps/api/core';
 import { useProposalNotifications, ProposalNotificationHandler } from './lib/useProposalNotifications';
@@ -54,6 +55,7 @@ function App() {
   const [showOnboarding, setShowOnboarding] = useState(false);
   const [showDetailDrawer, setShowDetailDrawer] = useState(false);
   const statsSyncRef = useRef<ReturnType<typeof setInterval> | null>(null);
+  const alertUnlistenRef = useRef<(() => void) | null>(null);
 
   // Hand Approval state
   const [pendingApprovalRun, setPendingApprovalRun] = useState<HandRun | null>(null);
@@ -155,6 +157,11 @@ function App() {
   useEffect(() => {
     let mounted = true;
 
+    // SaaS recovery listener (defined at useEffect scope for cleanup access)
+    const handleSaasRecovered = () => {
+      toast('SaaS 服务已恢复连接', 'success');
+    };
+
     const bootstrap = async () => {
       // 未登录时不启动 bootstrap，直接结束 loading
       if (!useSaaSStore.getState().isLoggedIn) {
@@ -208,7 +215,9 @@ function App() {
       // Step 4.5: Auto-start heartbeat engine for self-evolution
       try {
         const defaultAgentId = 'zclaw-main';
-        await intelligenceClient.heartbeat.init(defaultAgentId, {
+        // Restore config from localStorage (Rust side also restores from VikingStorage)
+        const savedConfig = localStorage.getItem('zclaw-heartbeat-config');
+        const heartbeatConfig = savedConfig ? JSON.parse(savedConfig) : {
           enabled: true,
           interval_minutes: 30,
           quiet_hours_start: '22:00',
@@ -216,7 +225,8 @@ function App() {
           notify_channel: 'ui',
           proactivity_level: 'standard',
           max_alerts_per_tick: 5,
-        });
+        };
+        await intelligenceClient.heartbeat.init(defaultAgentId, heartbeatConfig);
 
         // Sync memory stats to heartbeat engine
         try {
@@ -236,6 +246,21 @@ function App() {
         await intelligenceClient.heartbeat.start(defaultAgentId);
         log.debug('Heartbeat engine started for self-evolution');
 
+        // Listen for real-time heartbeat alerts and show as toast notifications
+        const unlistenAlerts = await safeListen<Array<{ title: string; content: string; urgency: string }>>(
+          'heartbeat:alert',
+          (alerts) => {
+            for (const alert of alerts) {
+              const alertType = alert.urgency === 'high' ? 'error'
+                : alert.urgency === 'medium' ? 'warning'
+                : 'info';
+              toast(`[${alert.title}] ${alert.content}`, alertType as 'info' | 'warning' | 'error');
+            }
+          }
+        );
+        // Store unlisten for cleanup
+        alertUnlistenRef.current = unlistenAlerts;
+
         // Set up periodic memory stats sync (every 5 minutes)
         const MEMORY_STATS_SYNC_INTERVAL = 5 * 60 * 1000;
         const statsSyncInterval = setInterval(async () => {
@@ -261,6 +286,9 @@ function App() {
         // Non-critical, continue without heartbeat
       }
 
+      // Listen for SaaS recovery events (from saasStore recovery probe)
+      window.addEventListener('saas-recovered', handleSaasRecovered);
+
       // Step 5: Restore embedding config to Rust backend (Tauri-only)
       if (isTauriRuntime()) {
         try {
@@ -339,6 +367,12 @@ function App() {
       if (statsSyncRef.current) {
         clearInterval(statsSyncRef.current);
       }
+      // Clean up heartbeat alert listener
+      if (alertUnlistenRef.current) {
+        alertUnlistenRef.current();
+      }
+      // Clean up SaaS recovery event listener
+      window.removeEventListener('saas-recovered', handleSaasRecovered);
     };
   }, [connect, onboardingNeeded, onboardingLoading, isLoggedIn]);