chore: initial commit of Wagtail backend scaffold

apps/core/models.py

@@ -0,0 +1,38 @@
+"""
+公共抽象模型。所有业务页面应继承 SEOablePage 而非直接继承 wagtail.models.Page，
+以统一获得 SEO 字段（详见 documents/设计方案分析与完善版.md §2.5）。
+"""
+from django.db import models
+from wagtail.admin.panels import FieldPanel
+from wagtail.models import Page
+
+
+class SEOablePage(Page):
+    seo_title_override = models.CharField(
+        max_length=70, blank=True, verbose_name="SEO 标题",
+        help_text="留空则使用页面标题",
+    )
+    seo_description_override = models.CharField(
+        max_length=160, blank=True, verbose_name="SEO 描述",
+    )
+    og_image = models.ForeignKey(
+        "wagtailimages.Image",
+        null=True,
+        blank=True,
+        on_delete=models.SET_NULL,
+        related_name="+",
+        verbose_name="社交分享图",
+    )
+    canonical_url = models.URLField(blank=True, verbose_name="Canonical URL")
+    schema_json = models.JSONField(blank=True, default=dict, verbose_name="结构化数据 (JSON-LD)")
+
+    promote_panels = Page.promote_panels + [
+        FieldPanel("seo_title_override"),
+        FieldPanel("seo_description_override"),
+        FieldPanel("og_image"),
+        FieldPanel("canonical_url"),
+        FieldPanel("schema_json"),
+    ]
+
+    class Meta:
+        abstract = True