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/ssl-monitoring/status_tracker.go

@@ -0,0 +1,111 @@
+
+package sslmonitoring
+
+import (
+	"sync"
+	"time"
+
+	"service-operation/pocketbase"
+)
+
+// SSLStatusTracker tracks SSL certificate status changes and notification timing using database persistence
+type SSLStatusTracker struct {
+	pbClient *pocketbase.PocketBaseClient
+	mu       sync.RWMutex
+}
+
+// NewSSLStatusTracker creates a new SSL status tracker with database persistence
+func NewSSLStatusTracker(pbClient *pocketbase.PocketBaseClient) *SSLStatusTracker {
+	return &SSLStatusTracker{
+		pbClient: pbClient,
+	}
+}
+
+// GetLastStatus returns the last known status for an SSL certificate from database
+func (sst *SSLStatusTracker) GetLastStatus(certID string) string {
+	sst.mu.RLock()
+	defer sst.mu.RUnlock()
+	
+	cert, err := sst.pbClient.GetSSLCertificateByID(certID)
+	if err != nil {
+		// log.Printf("🔍 [SSL-TRACKER] Error getting last status for %s: %v", certID, err)
+		return ""
+	}
+	
+	status := cert.Status
+	// log.Printf("🔍 [SSL-TRACKER] GetLastStatus for %s: %s", certID, status)
+	return status
+}
+
+// UpdateStatus updates the last known status for an SSL certificate in database
+func (sst *SSLStatusTracker) UpdateStatus(certID, status string) {
+	sst.mu.Lock()
+	defer sst.mu.Unlock()
+	
+	// Get current certificate to preserve other fields
+	cert, err := sst.pbClient.GetSSLCertificateByID(certID)
+	if err != nil {
+		// log.Printf("📝 [SSL-TRACKER] Error getting certificate for status update %s: %v", certID, err)
+		return
+	}
+	
+	oldStatus := cert.Status
+	
+	// Update only the status field
+	updateData := map[string]interface{}{
+		"status": status,
+	}
+	
+	err = sst.pbClient.UpdateSSLCertificate(certID, updateData)
+	if err != nil {
+		// log.Printf("📝 [SSL-TRACKER] Error updating status for %s: %v", certID, err)
+		return
+	}
+	
+	// log.Printf("📝 [SSL-TRACKER] UpdateStatus for %s: %s -> %s", certID, oldStatus, status)
+	_ = oldStatus // Prevent unused variable warning
+}
+
+// GetLastNotificationTime returns the last time a notification was sent for an SSL certificate from database
+func (sst *SSLStatusTracker) GetLastNotificationTime(certID string) time.Time {
+	sst.mu.RLock()
+	defer sst.mu.RUnlock()
+	
+	cert, err := sst.pbClient.GetSSLCertificateByID(certID)
+	if err != nil {
+		// log.Printf("⏰ [SSL-TRACKER] Error getting last notification time for %s: %v", certID, err)
+		return time.Time{}
+	}
+	
+	if cert.LastNotified == "" {
+		// log.Printf("⏰ [SSL-TRACKER] GetLastNotificationTime for %s: never notified", certID)
+		return time.Time{}
+	}
+	
+	lastTime, err := time.Parse(time.RFC3339, cert.LastNotified)
+	if err != nil {
+		// log.Printf("⏰ [SSL-TRACKER] Error parsing last notification time for %s: %v", certID, err)
+		return time.Time{}
+	}
+	
+	// log.Printf("⏰ [SSL-TRACKER] GetLastNotificationTime for %s: %v", certID, lastTime)
+	return lastTime
+}
+
+// SetLastNotificationTime sets the last notification time for an SSL certificate in database
+func (sst *SSLStatusTracker) SetLastNotificationTime(certID string, t time.Time) {
+	sst.mu.Lock()
+	defer sst.mu.Unlock()
+	
+	updateData := map[string]interface{}{
+		"last_notified": t.Format(time.RFC3339),
+	}
+	
+	err := sst.pbClient.UpdateSSLCertificate(certID, updateData)
+	if err != nil {
+		// log.Printf("⏰ [SSL-TRACKER] Error setting last notification time for %s: %v", certID, err)
+		return
+	}
+	
+	// log.Printf("⏰ [SSL-TRACKER] SetLastNotificationTime for %s: %v", certID, t)
+}