feat: Improve embedding request handling and support across channels

- Update EmbeddingRequest DTO to support more flexible input types
- Add input parsing method to handle various input formats
- Implement ConvertEmbeddingRequest for multiple channel adaptors
- Remove relayMode parameter from EmbeddingHelper
- Add input validation for embedding requests
- Simplify embedding request conversion for different channels

relay/channel/ollama/adaptor.go

@@ -46,12 +46,7 @@ func (a *Adaptor) ConvertRequest(c *gin.Context, info *relaycommon.RelayInfo, re
 	if request == nil {
 		return nil, errors.New("request is nil")
 	}
-	switch info.RelayMode {
-	case relayconstant.RelayModeEmbeddings:
-		return requestOpenAI2Embeddings(*request), nil
-	default:
-		return requestOpenAI2Ollama(*request), nil
-	}
+	return requestOpenAI2Ollama(*request), nil
 }
 
 func (a *Adaptor) ConvertRerankRequest(c *gin.Context, relayMode int, request dto.RerankRequest) (any, error) {
@@ -59,11 +54,9 @@ func (a *Adaptor) ConvertRerankRequest(c *gin.Context, relayMode int, request dt
 }
 
 func (a *Adaptor) ConvertEmbeddingRequest(c *gin.Context, info *relaycommon.RelayInfo, request dto.EmbeddingRequest) (any, error) {
-	//TODO implement me
-	return nil, errors.New("not implemented")
+	return requestOpenAI2Embeddings(request), nil
 }
 
-
 func (a *Adaptor) DoRequest(c *gin.Context, info *relaycommon.RelayInfo, requestBody io.Reader) (any, error) {
 	return channel.DoApiRequest(a, c, info, requestBody)
 }

relay/channel/ollama/relay-ollama.go

@@ -42,7 +42,7 @@ func requestOpenAI2Ollama(request dto.GeneralOpenAIRequest) *OllamaRequest {
 	}
 }
 
-func requestOpenAI2Embeddings(request dto.GeneralOpenAIRequest) *OllamaEmbeddingRequest {
+func requestOpenAI2Embeddings(request dto.EmbeddingRequest) *OllamaEmbeddingRequest {
 	return &OllamaEmbeddingRequest{
 		Model: request.Model,
 		Input: request.ParseInput(),
@@ -123,9 +123,9 @@ func ollamaEmbeddingHandler(c *gin.Context, resp *http.Response, promptTokens in
 }
 
 func flattenEmbeddings(embeddings [][]float64) []float64 {
-flattened := []float64{}
-for _, row := range embeddings {
-	flattened = append(flattened, row...)
+	flattened := []float64{}
+	for _, row := range embeddings {
+		flattened = append(flattened, row...)
+	}
+	return flattened
 }
-return flattened
-}