feat: support native Gemini Embedding

dto/gemini.go

@@ -210,16 +210,25 @@ type GeminiImagePrediction struct {
 
 // Embedding related structs
 type GeminiEmbeddingRequest struct {
+	Model                string            `json:"model,omitempty"`
 	Content              GeminiChatContent `json:"content"`
 	TaskType             string            `json:"taskType,omitempty"`
 	Title                string            `json:"title,omitempty"`
 	OutputDimensionality int               `json:"outputDimensionality,omitempty"`
 }
 
+type GeminiBatchEmbeddingRequest struct {
+	Requests []GeminiEmbeddingRequest `json:"requests"`
+}
+
 type GeminiEmbeddingResponse struct {
 	Embedding ContentEmbedding `json:"embedding"`
 }
 
+type GeminiBatchEmbeddingResponse struct {
+	Embeddings []ContentEmbedding `json:"embeddings"`
+}
+
 type ContentEmbedding struct {
 	Values []float64 `json:"values"`
 }