feat: Implement comprehensive multi-channel notification system with templating and SSL monitoring

- Add robust notification system supporting 7+ communication channels with intelligent message templating, resource monitoring, and SSL certificate alerts. Notification Channels: (Telegram, Discord, Slack, Signal, Email, Google Chat, Webhooks).

- This notification system provides enterprise-grade alerting capabilities with extensive customization options and multi-channel redundancy for critical service monitoring.

server/service-operation/notification/integration.go

@@ -0,0 +1,61 @@
+
+package notification
+
+import (
+	"log"
+	"time"
+
+	"service-operation/pocketbase"
+	"service-operation/types"
+)
+
+// ServiceNotifier provides an easy interface to send notifications for service events
+type ServiceNotifier struct {
+	manager *NotificationManager
+}
+
+// NewServiceNotifier creates a new service notifier
+func NewServiceNotifier(pbClient *pocketbase.PocketBaseClient) *ServiceNotifier {
+	return &ServiceNotifier{
+		manager: NewNotificationManager(pbClient),
+	}
+}
+
+// NotifyServiceStatus sends a notification for service status change
+func (sn *ServiceNotifier) NotifyServiceStatus(service pocketbase.Service, result *types.OperationResult) {
+	// Check if service has notification configured
+	if service.NotificationID == "" {
+		return
+	}
+
+	// Create notification payload
+	payload := &NotificationPayload{
+		ServiceName:  service.Name,
+		Status:       service.Status,
+		Host:         service.Host,
+		Port:         service.Port,
+		ServiceType:  service.ServiceType,
+		ResponseTime: result.ResponseTime.Milliseconds(),
+		Timestamp:    time.Now(),
+		ErrorMessage: result.Error,
+	}
+
+	// Send notification
+	if err := sn.manager.SendServiceNotification(payload, service.NotificationID, service.TemplateID); err != nil {
+		log.Printf("Failed to send notification for service %s: %v", service.Name, err)
+	} else {
+		log.Printf("Notification sent successfully for service %s", service.Name)
+	}
+}
+
+// NotifyCustom sends a custom notification
+func (sn *ServiceNotifier) NotifyCustom(notificationID, templateID, serviceName, status, message string) error {
+	payload := &NotificationPayload{
+		ServiceName: serviceName,
+		Status:      status,
+		Message:     message,
+		Timestamp:   time.Now(),
+	}
+
+	return sn.manager.SendServiceNotification(payload, notificationID, templateID)
+}