feat(core/workflow/repository): Add WorkflowExecutionRepository interface

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

api/core/workflow/repository/workflow_execution_repository.py

@@ -0,0 +1,42 @@
+from typing import Optional, Protocol
+
+from core.workflow.entities.workflow_execution_entities import WorkflowExecution
+
+
+class WorkflowExecutionRepository(Protocol):
+    """
+    Repository interface for WorkflowExecution.
+
+    This interface defines the contract for accessing and manipulating
+    WorkflowExecution data, regardless of the underlying storage mechanism.
+
+    Note: Domain-specific concepts like multi-tenancy (tenant_id), application context (app_id),
+    and other implementation details should be handled at the implementation level, not in
+    the core interface. This keeps the core domain model clean and independent of specific
+    application domains or deployment scenarios.
+    """
+
+    def save(self, execution: WorkflowExecution) -> None:
+        """
+        Save or update a WorkflowExecution instance.
+
+        This method handles both creating new records and updating existing ones.
+        The implementation should determine whether to create or update based on
+        the execution's ID or other identifying fields.
+
+        Args:
+            execution: The WorkflowExecution instance to save or update
+        """
+        ...
+
+    def get(self, execution_id: str) -> Optional[WorkflowExecution]:
+        """
+        Retrieve a WorkflowExecution by its ID.
+
+        Args:
+            execution_id: The workflow execution ID
+
+        Returns:
+            The WorkflowExecution instance if found, None otherwise
+        """
+        ...