fix: admin problems(open printing jobs slowly and frontend pages missing merchant field)

basic_info/admin.py

@@ -155,15 +155,21 @@ class EmployeeTypeAdmin(AdminBase):
 
 
 @admin.register(models.FrontendPage)
-class FrontendPageAdmin(AdminBase):
-    """前端页面管理"""
+class FrontendPageAdmin(admin.ModelAdmin):
+    """
+    前端页面管理
+    
+    注意：此模型不继承 AdminBase，因为 FrontendPage 是全局系统配置，
+    不关联 merchant（商户）。
+    """
     list_display = ('key', 'label', 'page_type', 'parent', 'sort_order', 'is_active')
     list_filter = ('page_type', 'is_active', 'parent')
     search_fields = ('key', 'label')
     list_editable = ('sort_order', 'is_active')
     ordering = ('sort_order', 'id')
+    autocomplete_fields = ('parent',)  # parent 也是 FrontendPage，支持自动完成
 
-    def get_readonly_fields(self, request, obj=...):
+    def get_readonly_fields(self, request, obj=None):
         # key 字段创建后不可修改
         if obj:
             return ['key']

printing/admin.py

@@ -180,6 +180,7 @@ class PrintingJobInline(admin.StackedInline):
     model = models.PrintingJob
     formset = PrintingJobInlineFormSet
     extra = 1
+    autocomplete_fields = ('product',)  # 避免加载所有产品导致页面卡死
 
 
 @admin.register(models.PrintingOrder)