feat(home/models.py): add ModuleLessonPage model

home/models.py

@@ -79,9 +79,32 @@ class CourseModulePage(Page):
         return self.title
 
     content_panels = Page.content_panels + ["body"]
+    subpage_types = ["home.ModuleLessonPage"]
     parent_page_types = ["home.CoursePage"]
 
 
+class ModuleLessonPage(Page):
+    body = RichTextField(blank=True)
+
+    @property
+    def module(self):
+        if hasattr(self, "get_parent"):
+            parent = self.get_parent()
+            if parent and hasattr(parent, "specific"):
+                return parent.specific
+        return None
+
+    @property
+    def full_title(self):
+        module = self.module
+        if module:
+            return f"{module.full_title} - {self.title}"
+        return self.title
+
+    content_panels = Page.content_panels + ["body"]
+    parent_page_types = ["home.CourseModulePage"]
+
+
 class EventPageTag(TaggedItemBase):
     content_object = ParentalKey(
         "home.EventPage",