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/ssl_client.go

@@ -0,0 +1,78 @@
+
+package sslmonitoring
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+
+	"service-operation/pocketbase"
+)
+
+// SSLClient handles SSL certificate data operations
+type SSLClient struct {
+	pbClient *pocketbase.PocketBaseClient
+}
+
+// NewSSLClient creates a new SSL client
+func NewSSLClient(pbClient *pocketbase.PocketBaseClient) *SSLClient {
+	return &SSLClient{
+		pbClient: pbClient,
+	}
+}
+
+// GetSSLCertificates fetches all SSL certificates from PocketBase
+func (sc *SSLClient) GetSSLCertificates() ([]SSLCertificate, error) {
+	url := fmt.Sprintf("%s/api/collections/ssl_certificates/records", sc.pbClient.GetBaseURL())
+	// log.Printf("🔍 [SSL-CLIENT] Fetching SSL certificates from: %s", url)
+	
+	resp, err := http.Get(url)
+	if err != nil {
+		// log.Printf("❌ [SSL-CLIENT] HTTP error: %v", err)
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		// log.Printf("❌ [SSL-CLIENT] Failed to fetch SSL certificates, status: %d", resp.StatusCode)
+		return nil, fmt.Errorf("failed to fetch SSL certificates, status: %d", resp.StatusCode)
+	}
+
+	var response struct {
+		Items []SSLCertificate `json:"items"`
+	}
+	
+	if err := json.NewDecoder(resp.Body).Decode(&response); err != nil {
+		// log.Printf("❌ [SSL-CLIENT] Error decoding response: %v", err)
+		return nil, err
+	}
+
+	// log.Printf("✅ [SSL-CLIENT] Successfully fetched %d SSL certificates", len(response.Items))
+	return response.Items, nil
+}
+
+// UpdateSSLCertificate updates SSL certificate status and notification time
+func (sc *SSLClient) UpdateSSLCertificate(certID string, data map[string]interface{}) error {
+	url := fmt.Sprintf("%s/api/collections/ssl_certificates/records/%s", sc.pbClient.GetBaseURL(), certID)
+	
+	req, err := http.NewRequest(http.MethodPatch, url, nil)
+	if err != nil {
+		return fmt.Errorf("failed to create SSL certificate update request: %v", err)
+	}
+	
+	req.Header.Set("Content-Type", "application/json")
+
+	client := &http.Client{}
+	resp, err := client.Do(req)
+	if err != nil {
+		return fmt.Errorf("failed to update SSL certificate: %v", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("failed to update SSL certificate, status: %d", resp.StatusCode)
+	}
+
+	// log.Printf("✅ [SSL-CLIENT] Successfully updated SSL certificate: %s", certID)
+	return nil
+}