Fix/workflow (#92)

* fix(workflow): use loose rendering for end-node variables

* fix(workflow): use int type for memory node config id

* fix(workflow): handle missing environment variable defaults

* fix(workflow): render jinja variables with actual values in non-strict mode

* fix(workflow): support reordering without a rerank model in knowledge base

* fix(workflow): fix typo in key value

api/app/templates/workflows/simple_qa/template.yml

@@ -53,7 +53,7 @@ nodes:
     type: end
     name: 结束
     config:
-      output: "{{llm_qa.output}}"
+      output: "{{ llm_qa.output }}"
     position:
       x: 900
       y: 100