refactor(graph_engine): Move ErrorHandler into a single file package

Signed-off-by: -LAN- <laipz8200@outlook.com>

api/.importlinter

@@ -58,7 +58,7 @@ layers =
     orchestration
     command_processing
     event_management
-    error_handling
+    error_handler
     graph_traversal
     graph_state_manager
     worker_management

api/core/workflow/graph_engine/error_handler.py

@@ -23,7 +23,7 @@ from core.workflow.graph_events import (
 from core.workflow.node_events import NodeRunResult
 
 if TYPE_CHECKING:
-    from ..domain import GraphExecution
+    from .domain import GraphExecution
 
 logger = logging.getLogger(__name__)
 

api/core/workflow/graph_engine/error_handling/__init__.py

@@ -1,12 +0,0 @@
-"""
-Error handling for graph engine.
-
-This package provides error handling functionality for managing
-node execution failures with different recovery strategies.
-"""
-
-from .error_handler import ErrorHandler
-
-__all__ = [
-    "ErrorHandler",
-]

api/core/workflow/graph_engine/event_management/event_handlers.py

@@ -31,7 +31,7 @@ from ..domain.graph_execution import GraphExecution
 from ..response_coordinator import ResponseStreamCoordinator
 
 if TYPE_CHECKING:
-    from ..error_handling import ErrorHandler
+    from ..error_handler import ErrorHandler
     from ..graph_state_manager import GraphStateManager
     from ..graph_traversal import EdgeProcessor
     from .event_manager import EventManager

api/core/workflow/graph_engine/graph_engine.py

@@ -31,7 +31,7 @@ from models.enums import UserFrom
 from .command_processing import AbortCommandHandler, CommandProcessor
 from .domain import ExecutionContext, GraphExecution
 from .entities.commands import AbortCommand
-from .error_handling import ErrorHandler
+from .error_handler import ErrorHandler
 from .event_management import EventHandler, EventManager
 from .graph_state_manager import GraphStateManager
 from .graph_traversal import EdgeProcessor, SkipPropagator