fix: resolve circular import in Component class (#8839)

* fix: resolve circular import in Component class

Move graph-related imports inside methods to break circular dependency chain:
- Move create_state_model import inside _build_state_model method
- Move has_chat_output import inside is_connected_to_chat_output method

This enables component testing without circular import errors that were
preventing execution of component test suites.

Fixes circular import chain:
Component -> graph.state.model -> graph.vertex -> Component

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* [autofix.ci] apply automated fixes

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Gabriel Luiz Freitas Almeida <gabriel@langflow.org>

src/backend/base/langflow/custom/custom_component/component.py

@@ -24,8 +24,11 @@ from langflow.base.tools.constants import (
 from langflow.custom.tree_visitor import RequiredInputsVisitor
 from langflow.exceptions.component import StreamingError
 from langflow.field_typing import Tool  # noqa: TC001 Needed by _add_toolkit_output
-from langflow.graph.state.model import create_state_model
-from langflow.graph.utils import has_chat_output
+
+# Lazy import to avoid circular dependency
+# from langflow.graph.state.model import create_state_model
+# Lazy import to avoid circular dependency
+# from langflow.graph.utils import has_chat_output
 from langflow.helpers.custom import format_type
 from langflow.memory import astore_message, aupdate_messages, delete_message
 from langflow.schema.artifact import get_artifact_type, post_process_raw
@@ -298,6 +301,9 @@ class Component(CustomComponent):
         fields = {}
         for output in self._outputs_map.values():
             fields[output.name] = getattr(self, output.method)
+        # Lazy import to avoid circular dependency
+        from langflow.graph.state.model import create_state_model
+
         self._state_model = create_state_model(model_name=model_name, **fields)
         return self._state_model
 
@@ -1447,6 +1453,9 @@ class Component(CustomComponent):
             )
 
     def is_connected_to_chat_output(self) -> bool:
+        # Lazy import to avoid circular dependency
+        from langflow.graph.utils import has_chat_output
+
         return has_chat_output(self.graph.get_vertex_neighbors(self._vertex))
 
     def _should_skip_message(self, message: Message) -> bool: