fix: remove mode from llm invoke request params

internal/types/entities/requests/model.go

@@ -14,7 +14,6 @@ type BaseRequestInvokeModel struct {
 }
 
 type InvokeLLMSchema struct {
-	Mode            string                             `json:"mode" validate:"required"`
 	ModelParameters map[string]any                     `json:"model_parameters"  validate:"omitempty,dive,is_basic_type"`
 	PromptMessages  []model_entities.PromptMessage     `json:"prompt_messages"  validate:"omitempty,dive"`
 	Tools           []model_entities.PromptMessageTool `json:"tools" validate:"omitempty,dive"`