✨ feat(adaptor): refactor response handlers to return usage first and improve error handling

relay/channel/ollama/relay-ollama.go

@@ -96,7 +96,7 @@ func ollamaEmbeddingHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *h
 		return nil, types.NewError(err, types.ErrorCodeBadResponseBody)
 	}
 	if ollamaEmbeddingResponse.Error != "" {
-		return nil, types.NewError(err, types.ErrorCodeBadResponseBody)
+		return nil, types.NewError(fmt.Errorf("ollama error: %s", ollamaEmbeddingResponse.Error), types.ErrorCodeBadResponseBody)
 	}
 	flattenedEmbeddings := flattenEmbeddings(ollamaEmbeddingResponse.Embedding)
 	data := make([]dto.OpenAIEmbeddingResponseItem, 0, 1)