fix embedding_model (#1698)

### What problem does this PR solve?
fix embedding_model #1692
### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

Signed-off-by: seaver <zhudan187@qq.com>

rag/llm/embedding_model.py

         )  # local embedding for LmStudio donot count tokens
 
     def encode_queries(self, text):
-        res = self.client.embeddings.create(text, model=self.model_name)
-        return np.array(res.data[0].embedding), 1024
+        embds, cnt = self.encode([text])
+        return np.array(embds[0]), cnt
 
 
 class AzureEmbed(OpenAIEmbed):