Support Xinference (#320)

### What problem does this PR solve?

Issue link:#299

### Type of change

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

api/apps/conversation_app.py

@@ -360,6 +360,7 @@ def use_sql(question, field_map, tenant_id, chat_mdl):
             "|" for r in tbl["rows"]]
     rows = "\n".join([r + f" ##{ii}$$ |" for ii, r in enumerate(rows)])
     rows = re.sub(r"T[0-9]{2}:[0-9]{2}:[0-9]{2}(\.[0-9]+Z)?\|", "|", rows)
+
     if not docid_idx or not docnm_idx:
         chat_logger.warning("SQL missing field: " + sql)
         return {