调整页面布局，增加内容容器，优化页脚位置

src/views/layouts/pure.pug

@@ -5,8 +5,9 @@ block $$head
   block pageHead
 
 block $$content
-  block pageContent
-    footer
+  .content(style="flex:1;height:0")
+    block pageContent
+  footer
     include /htmx/footer.pug
 
 block $$scripts

src/views/layouts/root.pug

@@ -32,7 +32,7 @@ html(lang="zh-CN")
           height: initial;
         }
     div(data-simplebar style="height: 100%")
-      div(style="height: 100%; display: flex; flex-direction: column" id="aaaa")
+      div(style="height: 100%; display: flex; flex-direction: column")
         block $$content
     block $$scripts
     +js('lib/bg-change.js')