refactor(handlers): standardize logging using request attributes helper

- Replace manual IP logging with the `withRequestLogAttrs` helper in authentication handlers.
- Add user activity logging for API documentation and login page views.
- Clean up log calls to use variadic expansion of request attributes.

backend/static/css/50-admin.css

@@ -218,12 +218,16 @@
   width: 100%;
   max-width: 2.2rem;
   min-height: 0;
+  height: 100%;
   display: flex;
   align-items: flex-end;
   justify-content: center;
+  align-self: stretch;
 }
 
 .bar-chart-bar {
+  display: block;
+  flex: 0 0 auto;
   width: 100%;
   min-height: 0;
   border-radius: 6px 6px 0 0;