header and footer（待續）

main.py

@@ -167,6 +167,8 @@ def _normalize_page_tree(slug: str, tree: dict[str, Any]) -> dict[str, Any]:
                         "show_in_nav": bool(item.get("show_in_nav", True)),
                         "is_homepage": bool(item.get("is_homepage", False)),
                         "requires_password": bool(item.get("requires_password", False)),
+                        "has_header": item.get("has_header") is not False,
+                        "has_footer": bool(item.get("has_footer", False)),
                     })
             elif item_type == "folder":
                 name = item.get("name")
@@ -194,6 +196,8 @@ def _normalize_page_tree(slug: str, tree: dict[str, Any]) -> dict[str, Any]:
                 "show_in_nav": True,
                 "is_homepage": rel == "index.html",
                 "requires_password": False,
+                "has_header": True,
+                "has_footer": False,
             })
     return normalized