新增单词管理后台,分类有单词时禁止删除,支持 Docker 一键部署

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend/internal/handlers/response.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"net/http"
 
+	"github.com/fish/language/backend/internal/services"
 	"github.com/jackc/pgx/v5"
 )
 
@@ -30,6 +31,9 @@ func MapError(err error) (status int, code int, message string) {
 	if errors.Is(err, pgx.ErrNoRows) {
 		return http.StatusNotFound, 10001, "resource not found"
 	}
+	if errors.Is(err, services.ErrCategoryNotEmpty) {
+		return http.StatusConflict, 10005, "category has words and cannot be deleted"
+	}
 	return http.StatusInternalServerError, 10000, "internal server error"
 }