fix: add db_icon, host, connection_flag to single environment API response

The get_environment endpoint was missing these fields in the connection
object, causing broken logo in the edit environment drawer.

Author: wicky-zipstack

backend/backend/application/session/env_session.py

@@ -129,6 +129,9 @@ def get_environment(self, environment_id: str) -> dict[str, Any]:
                 "id": env_model.connection_model.connection_id,
                 "name": env_model.connection_model.connection_name,
                 "datasource_name": env_model.connection_model.datasource_name,
+                "db_icon": import_file(f"visitran.adapters.{env_model.connection_model.datasource_name}").ICON,
+                "host": _get_host_display(env_model.connection_model),
+                "connection_flag": env_model.connection_model.connection_flag,
             },
             "connection_details": env_model.masked_connection_data,
             "custom_data": env_model.env_custom_data,