feat(api): add auth tag for authentication bootstrap endpoints in OpenAPI specification

backend/app/main.py

@@ -41,6 +41,12 @@ if TYPE_CHECKING:
 configure_logging()
 logger = get_logger(__name__)
 OPENAPI_TAGS = [
+    {
+        "name": "auth",
+        "description": (
+            "Authentication bootstrap endpoints for resolving caller identity and session context."
+        ),
+    },
     {
         "name": "health",
         "description": (