Lab assignment management UI and student variant view

- progress-service: POST /api/v1/assign (manual variant), GET /api/v1/assignments?labId=
  (enriched assignments), fixed enrich() to return real variant number/title/statement
- gateway: routes for /api/v1/assign and /api/v1/levels (exact paths)
- web: lab detail page shows students grouped with level and variant selects,
  group filter, distribute/redistribute buttons, source badge (auto/manual)
- web: student dashboard renders variant statement via libs/markdown (spoilers,
  code highlight, sanitized)
- academic-service: unquote YAML front-matter values (variant numbers were quoted)
- academic-service: LabLevelDetail.id for level references

web/src/main/resources/templates/student/dashboard.html

@@ -5,23 +5,25 @@
 <div id="content">
     <h1 class="page-title">Здравствуйте, <span th:text="${currentUser.name}">студент</span></h1>
     <p class="text-sm text-muted mb-6">Ваши лабораторные работы</p>
+
     <div th:if="${#lists.isEmpty(assignments)}" class="card card-body text-muted">
         Пока нет назначенных лабораторных. Ожидайте, пока преподаватель распределит варианты.
     </div>
-    <div class="card card-flush" th:unless="${#lists.isEmpty(assignments)}">
-        <table>
-            <thead><tr><th>№</th><th>Название</th><th>Вариант</th><th>Срок сдачи</th><th>Дата защиты</th><th>Статус</th></tr></thead>
-            <tbody>
-            <tr th:each="a : ${assignments}">
-                <td th:text="${a.labNumber}">1</td>
-                <td th:text="${a.labTitle}">—</td>
-                <td th:text="${a.variantNumber}">—</td>
-                <td class="text-sm text-muted" th:text="${a.deadlineAt}">—</td>
-                <td class="text-sm text-muted" th:text="${a.defenseAt}">—</td>
-                <td><span class="badge badge-warn">назначено</span></td>
-            </tr>
-            </tbody>
-        </table>
+
+    <div th:each="a : ${assignments}" class="card mb-6">
+        <div class="card-body">
+            <div class="flex flex-wrap items-center justify-between gap-4">
+                <h2 class="section-title" th:text="|ЛР ${a.labNumber}. ${a.labTitle}|">ЛР</h2>
+                <div class="flex gap-2 items-center">
+                    <span class="badge badge-ok">Вариант <span class="font-mono" th:text="${a.variantNumber}">—</span></span>
+                    <span th:if="${a.levelTitle}" class="badge badge-warn" th:text="${a.levelTitle}">—</span>
+                </div>
+            </div>
+            <p class="text-sm text-muted" th:if="${a.variantTitle}" th:text="${a.variantTitle}">—</p>
+            <p class="text-sm text-muted" th:if="${a.deadlineAt}" th:text="|Срок сдачи: ${a.deadlineAt}|">—</p>
+            <p class="text-sm text-muted" th:if="${a.defenseAt}" th:text="|Защита: ${a.defenseAt}|">—</p>
+            <div class="md-body mt-4" th:utext="${a.statementHtml}"></div>
+        </div>
     </div>
 </div>
 </body>