AI Problem Solver implementation and various fixes

- Implement 'Show Problems Only' toggle combining degraded status, high CPU/memory alerts, and needs backup filters
- Add 'Investigate with AI' button to filter bar for problematic guests
- Fix dashboard column sizing inconsistencies between bars and sparklines view modes
- Fix PBS backups display and polling
- Refine AI prompt for general-purpose usage
- Fix frontend flickering and reload loops during initial load
- Integrate persistent SQLite metrics store with Monitor
- Fortify AI command routing with improved validation and logging
- Fix CSRF token handling for note deletion
- Debug and fix AI command execution issues
- Various AI reliability improvements and command safety enhancements

cmd/pulse/main.go

@@ -183,8 +183,8 @@ func runServer() {
 		Addr:              fmt.Sprintf("%s:%d", cfg.BackendHost, cfg.FrontendPort),
 		Handler:           router.Handler(),
 		ReadHeaderTimeout: 15 * time.Second,
-		WriteTimeout:      60 * time.Second, // Increased from 15s to 60s to support large JSON responses (e.g., mock data)
-		IdleTimeout:       60 * time.Second,
+		WriteTimeout:      0, // Disabled to support SSE/streaming - each handler manages its own deadline
+		IdleTimeout:       120 * time.Second,
 	}
 
 	// Start config watcher for .env file changes