Add Certificates page and Traefik API frontend client

backend/internal/models/traefik.go

@@ -33,6 +33,9 @@ type Service struct {
 	LoadBalancer *LoadBalancer      `json:"load_balancer,omitempty"`
 	ServerStatus map[string]string  `json:"server_status,omitempty"`
 	Status       string             `json:"status"`
+	// v3.7: service-level middlewares (HTTP services can declare middlewares directly)
+	Middlewares  []string           `json:"middlewares,omitempty"`
+	// Compatibility: some API responses use camelCase
 }
 
 type LoadBalancer struct {