Tables: initial ФИО order, click-to-sort columns, substring search

- identity group detail (and thus every student list) is ordered by full name;
  defense rows on the group page sorted by name + lab number
- tablekit.js: click a header to sort (numeric-aware, ru locale), second click
  flips direction (▲/▼ indicator); search input with data-target filters rows
  by substring live
- tables wired: group matrix (with data-sort on variant cells), defense table
  (data-sort on status/date), students table, lab assignment lists per group,
  groups list and labs list; name/number columns pre-marked ascending
- non-sortable columns marked data-nosort (checkbox/actions)

web/src/main/resources/templates/fragments/base.html

@@ -10,6 +10,7 @@
     <link id="hljs-dark" rel="stylesheet" th:href="@{/css/hljs-github-dark.css}" disabled>
     <script th:src="@{/js/htmx.min.js}" defer></script>
     <script th:src="@{/js/highlight.min.js}" defer></script>
+    <script th:src="@{/js/tablekit.js}" defer></script>
     <script>
         (function(){
             var t = localStorage.getItem('lms-theme') || 'light';