refactor(api): continue decoupling dify_graph from API concerns (#33580)

Signed-off-by: -LAN- <laipz8200@outlook.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: WH-2099 <wh2099@pm.me>

api/core/workflow/template_rendering.py

@@ -0,0 +1,29 @@
+from __future__ import annotations
+
+from collections.abc import Mapping
+from typing import Any
+
+from core.helper.code_executor.code_executor import CodeExecutionError, CodeExecutor
+from dify_graph.nodes.code.entities import CodeLanguage
+from dify_graph.template_rendering import Jinja2TemplateRenderer, TemplateRenderError
+
+
+class CodeExecutorJinja2TemplateRenderer(Jinja2TemplateRenderer):
+    """Sandbox-backed Jinja2 renderer for workflow-owned node composition."""
+
+    def render_template(self, template: str, variables: Mapping[str, Any]) -> str:
+        try:
+            result = CodeExecutor.execute_workflow_code_template(
+                language=CodeLanguage.JINJA2,
+                code=template,
+                inputs=variables,
+            )
+        except Exception as exc:
+            if isinstance(exc, CodeExecutionError):
+                raise TemplateRenderError(str(exc)) from exc
+            raise
+
+        rendered = result.get("result")
+        if not isinstance(rendered, str):
+            raise TemplateRenderError("Template render result must be a string.")
+        return rendered