webui: Make some user preferences configurable

This extends 09f0237560.

- Extend user_pref with configurable profile fields and automatic migration defaults
- Move user info responses to read from user_pref instead of hardcoded values
- Add admin profile page for editing UI values after login

Signed-off-by: Sean Du <do4suki@gmail.com>

static/templates/admin/nav/side.html

@@ -2,6 +2,12 @@
 <div class="layui-side">
     <div class="layui-side-scroll">
         <ul class="layui-nav layui-nav-tree" lay-filter="test">
+            <li class="layui-nav-item {{ if eq .menu 2 }} layui-nav-itemed {{ end }}">
+                <a class="" href="javascript:;">用户设置</a>
+                <dl class="layui-nav-child">
+                    <dd {{ if eq .url "/admin/profile" }} class="layui-this" {{ end }}><a href="/admin/profile">个人资料</a></dd>
+                </dl>
+            </li>
             <li class="layui-nav-item {{ if eq .menu 1 }} layui-nav-itemed {{ end }}">
                 <a class="" href="javascript:;">卡片管理</a>
                 <dl class="layui-nav-child">
@@ -14,4 +20,4 @@
         </ul>
     </div>
 </div>
-{{ end }}
+{{ end }}