feat: add guided exploration and share user-started MCP backend

tests/unit/admin_console/test_model_settings.py

@@ -93,7 +93,14 @@ def test_new_install_uses_playones_endpoint_without_overriding_saved_url(monkeyp
 
 def test_model_presets_include_flash_pro_and_luna_without_restricting_custom_names():
     presets = service.get_model_settings()["model_presets"]
-    assert presets == ["gpt-5.6-luna", "gpt-6-luna", "mimo-v2.6-flash", "mimo-v2.6-pro"]
+    assert presets == [
+        "gpt-6.1-sol",
+        "gpt-6-astra",
+        "gpt-5.6-luna",
+        "gpt-6-luna",
+        "mimo-v2.6-flash",
+        "mimo-v2.6-pro",
+    ]
     assert service.ModelSettingsUpdate(model="custom/model-v2").model == "custom/model-v2"