前端修复，日志功能加入

.trellis/spec/frontend/component-guidelines.md

@@ -20,6 +20,13 @@ the reusable UI units.
   application frame lives in `src/main/webapp/WEB-INF/jsp/common/header.jspf`
   and owns the dark sidebar, top utility bar, role workbench links, module
   navigation, global search, user display, and logout link.
+- Any `.jspf` fragment that contains user-visible Simplified Chinese text must
+  declare `<%@ page pageEncoding="UTF-8" %>` at the top. Do not rely only on the
+  including JSP page or response `Content-Type`; Tomcat/Jasper can otherwise
+  compile the fragment with a non-UTF-8 default and render mojibake.
+- JSP-rendered HTML responses must be served as `text/html;charset=UTF-8` by
+  the encoding filter or the JSP page directive. Request/response character
+  encoding alone is not enough for browsers to decode Simplified Chinese safely.
 - Preserve role-conditioned navigation in that shared frame: administrator-only
   links stay inside `sessionScope.userRole == 'administrator'`; staff links stay
   inside `administrator or librarian`; reader-only links stay inside