Allow re-copying invite configs and end-user server choice (v3.0.1).

Invite pages keep created configs for repeat copy; guest/invite can pick a server when enabled.

Co-authored-by: Cursor <cursoragent@cursor.com>

translations/en.json

@@ -537,6 +537,10 @@
     "aivpn_picking":  "Scoring protocols…",
     "aivpn_on":  "On",
     "aivpn_protocol_option":  "AIVPN (auto)",
+    "choose_server":  "Choose server",
+    "allow_server_choice":  "Allow user to choose server",
+    "allow_server_choice_hint":  "End users pick a server when creating a config. Default server is used as fallback.",
+    "invite_no_saved_configs":  "No configs yet. Create one above — you can copy it again anytime.",
     "revproxy_title":  "Reverse Proxy",
     "revproxy_subtitle":  "High-performance traffic obfuscation: hide your VPN endpoint behind a polished public-facing site, drop the DPI footprint.",
     "management":  "Management",