feat: 新增隐私政策内容页(apps.core.SimpleContentPage)及seed命令，更新设计文档

apps/core/models.py

@@ -4,6 +4,7 @@
 """
 from django.db import models
 from wagtail.admin.panels import FieldPanel
+from wagtail.fields import RichTextField
 from wagtail.models import Page
 
 
@@ -36,3 +37,19 @@ class SEOablePage(Page):
 
     class Meta:
         abstract = True
+
+
+class SimpleContentPage(SEOablePage):
+    """通用富文本内容页，用于隐私政策、服务条款等法务/说明类页面。"""
+
+    body = RichTextField(blank=True, verbose_name="正文内容")
+
+    content_panels = SEOablePage.content_panels + [
+        FieldPanel("body"),
+    ]
+
+    parent_page_types = ["home.HomePage"]
+    subpage_types = []
+
+    class Meta:
+        verbose_name = "通用内容页"