Add service_conf and llm_factories options to Helm chart (#8607)

### What problem does this PR solve?

### Type of change

- [X] New Feature (non-breaking change which adds functionality)

helm/templates/ragflow_config.yaml

@@ -1,6 +1,20 @@
 ---
 apiVersion: v1
 kind: ConfigMap
+metadata:
+  name: ragflow-service-config
+data:
+  {{- with .Values.ragflow.service_conf }}
+  local.service_conf.yaml: |
+    {{- . | toYaml | nindent 4 }}
+  {{- end }}
+  {{- with .Values.ragflow.llm_factories }}
+  llm_factories.json: |
+    {{- . | toPrettyJson | nindent 4 }}
+  {{- end }}
+---
+apiVersion: v1
+kind: ConfigMap
 metadata:
   name: nginx-config
 data: