Fix: UI not refreshing after ZFS pool operations due to caching

internal/httpapp/app.go

@@ -52,6 +52,7 @@ type App struct {
 	backupService      *backup.Service
 	maintenanceService *maintenance.Service
 	tlsConfig          *tls.Config
+	cache              *ResponseCache
 }
 
 func New(cfg Config) (*App, error) {
@@ -175,6 +176,7 @@ func New(cfg Config) (*App, error) {
 		backupService:      backupService,
 		maintenanceService: maintenanceService,
 		tlsConfig:          tlsConfig,
+		cache:              NewResponseCache(5 * time.Minute),
 	}
 
 	// Start snapshot scheduler (runs every 15 minutes)