fix: System Overview widget - expose monitoring/health endpoints publicly + fix data formats

- Add /api/v1/monitoring/stats and /api/v1/health-checks/status to PUBLIC_ROUTES
  so the frontend widget can fetch without auth
- Transform monitoring stats response from nested {cpu:{percent}} to flat
  {cpu: number, memory: number, memoryUsage: number} for the widget
- Add summary {healthy, unhealthy, total} to health-checks/status response

dashcaddy-api/routes/health.js

@@ -322,9 +322,16 @@ module.exports = function({
   // ===== HEALTH CHECK (health-checker module) =====
 
   // Get current status for all services
+  // Returns per-service status plus a summary for the System Overview widget:
+  //   { status: { ... }, summary: { healthy, unhealthy, total } }
   router.get('/health-checks/status', asyncHandler(async (req, res) => {
     const status = healthChecker.getCurrentStatus();
-    success(res, { status });
+    // Build summary for the overview widget
+    const entries = Object.values(status);
+    const healthy = entries.filter(s => s.status === 'up' || s.status === 'healthy').length;
+    const unhealthy = entries.filter(s => s.status === 'down' || s.status === 'unhealthy').length;
+    const total = entries.length;
+    success(res, { status, summary: { healthy, unhealthy, total } });
   }, 'health-check-status'));
 
   // Get service statistics