consistent error handling for pull and generate

api/types.go

@@ -1,24 +1,5 @@
 package api
 
-import (
-	"fmt"
-	"net/http"
-	"strings"
-)
-
-type Error struct {
-	Code    int32  `json:"code"`
-	Message string `json:"message"`
-}
-
-func (e Error) Error() string {
-	if e.Message == "" {
-		return fmt.Sprintf("%d %v", e.Code, strings.ToLower(http.StatusText(int(e.Code))))
-	}
-
-	return e.Message
-}
-
 type PullRequest struct {
 	Model string `json:"model"`
 }
@@ -27,7 +8,6 @@ type PullProgress struct {
 	Total     int64   `json:"total"`
 	Completed int64   `json:"completed"`
 	Percent   float64 `json:"percent"`
-	Error     Error   `json:"error"`
 }
 
 type GenerateRequest struct {