Add read-only support and UI indicators for MikroTik dynamic peers (#733)

* Add dynamic Mikrotik peer support & UI/i18n

Introduce handling for dynamically created Mikrotik peers: add Dynamic/IsDynamic fields to domain, peer and interface models and API models; include "dynamic" in Mikrotik queries; skip updates/deletes for dynamic peers; sync dynamic flag when restoring state. Prevent modifying/deleting dynamic peers in manager. UI: disable selection/edit for dynamic peers and show badge. Implement Mikrotik interface hook execution. Add i18n keys/translations for dynamic-peer messages across languages.

* Fix Mikrotik hooks implementation and UI visibility

internal/config/backend.go

@@ -61,6 +61,7 @@ func (b *Backend) Validate() error {
 type BackendBase struct {
 	Id          string `yaml:"id"`           // A unique id for the backend
 	DisplayName string `yaml:"display_name"` // A display name for the backend
+	Type        string `yaml:"-"`            // The type of the backend (e.g. local, mikrotik, pfsense)
 
 	IgnoredInterfaces []string `yaml:"ignored_interfaces"` // A list of interface names that should be ignored by this backend (e.g., "wg0")
 }