feat: Enhance AI Workflow with Variable Contracts and Input Mapping

- Added ConfigSchema, InputSchema, OutputSchema, and DefaultInputs to AIWorkflowNodeSpecResponse.
- Implemented BuildAIWorkflowNodeSpecs to include variable contracts for start and send_reply nodes.
- Introduced applyAutoInputMappings to automatically map inputs based on node connections.
- Enhanced validation to check for required input mappings in workflows.
- Updated workflow editor to support variable selection for node inputs.
- Translated node names and labels to Chinese for better localization.
- Added tests for variable mapping and validation logic.

internal/builders/ai_workflow_builder.go

@@ -78,6 +78,10 @@ func BuildAIWorkflowNodeSpecs(list []workflowregistry.NodeSpec) []response.AIWor
 			RiskLevel:                       item.RiskLevel,
 			Interruptible:                   item.Interruptible,
 			RequiresConfirmationPredecessor: item.RequiresConfirmationPredecessor,
+			ConfigSchema:                    item.ConfigSchema,
+			InputSchema:                     item.InputSchema,
+			OutputSchema:                    item.OutputSchema,
+			DefaultInputs:                   item.DefaultInputs,
 		})
 	}
 	return ret