Add 3x-ui VLESS configs and guest access without registration.

Guests can open a public link to view or create VPN configs; panel creates VLESS clients via the 3x-ui API.

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

db/store.py

@@ -44,6 +44,17 @@ DEFAULT_SETTINGS = {
         'xui_create_conns': False,
         'xui_server_id': 0,
         'xui_protocol': 'xray',
+        'xui_inbound_id': 0,
+    },
+    'guest': {
+        'enabled': False,
+        'token': '',
+        'password_hash': None,
+        'user_id': '',
+        'allow_create': False,
+        'create_protocol': 'xui',
+        'create_server_id': 0,
+        'create_inbound_id': 0,
     },
 }