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

frontend/src/lang/translations/en.json

@@ -138,7 +138,9 @@
     "peer-expiring": "Peer is expiring at",
     "peer-connected": "Connected",
     "peer-not-connected": "Not Connected",
-    "peer-handshake": "Last handshake:"
+    "peer-handshake": "Last handshake:",
+    "peer-dynamic": "Dynamic Peer",
+    "peer-dynamic-no-edit": "This peer is dynamically created and cannot be edited or deleted."
   },
   "users": {
     "headline": "User Administration",
@@ -648,4 +650,4 @@
       }
     }
   }
-}
+}