Phase 2+5: lab submissions and student lab flow

- progress: submissions table+V4; SubmissionService (deadline-gated submit,
  unlimited resubmits, per-student history, zip download); files on disk
  data/submissions/{student}/{lab}/{seq}/
- student API: POST submit (multipart), GET me submissions, download; admin
  GET lab submissions + admin download (zip pack)
- progress enrich(): labId in MeAssignment; web DTO aligned
- web: /student dashboard (avg/best/worst cards), /student/labs cards,
  /student/labs/{id}: condition md, variant block, submit form, history;
  'Лабораторные' link in nav for students
- admin: submissions column on lab assignment table + download link
- fixed long-standing template bug: broken @{} expression (missing }) in
  admin/lab and student/lab

web/src/main/resources/application.yml

@@ -10,6 +10,10 @@ server:
 spring:
   application:
     name: web
+  servlet:
+    multipart:
+      max-file-size: 30MB
+      max-request-size: 120MB
   thymeleaf:
     cache: false
 

web/src/main/resources/templates/admin/lab.html

@@ -98,7 +98,7 @@
         <h3 class="group-title" th:text="${g.groupName}">Группа</h3>
         <div class="card card-flush mb-6">
             <table>
-                <thead><tr><th>Студент</th><th>Логин</th><th>Уровень</th><th>Вариант</th><th>Источник</th></tr></thead>
+                <thead><tr><th>Студент</th><th>Логин</th><th>Уровень</th><th>Вариант</th><th>Источник</th><th>Сдача</th></tr></thead>
                 <tbody>
                 <tr th:each="s : ${g.students}">
                     <td th:text="${s.fullName}">—</td>
@@ -130,8 +130,12 @@
                     </td>
                     <td><span th:if="${s.variantNumber != null}" class="font-mono" th:text="${s.variantNumber}">—</span></td>
                     <td><span class="badge" th:classappend="${s.source == 'вручную'} ? 'badge-warn' : 'badge-ok'" th:text="${s.source}">—</span></td>
+                    <td><a th:if="${s.submissionId}" class="badge badge-ok"
+                           th:href="'/admin/submissions/' + ${s.submissionId} + '/download'"
+                           th:text="|попытка ${s.submissionSeq}|">↓</a>
+                        <span th:unless="${s.submissionId}" class="text-muted">не сдано</span></td>
                 </tr>
-                <tr th:if="${#lists.isEmpty(g.students)}"><td colspan="6" class="empty">В группе нет студентов.</td></tr>
+                <tr th:if="${#lists.isEmpty(g.students)}"><td colspan="7" class="empty">В группе нет студентов.</td></tr>
                 </tbody>
             </table>
         </div>

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

@@ -26,6 +26,7 @@
                 <th:block th:if="${currentUser != null}">
                     <a th:if="${currentUser.admin}" th:href="@{/admin/groups}" class="nav-link">Группы</a>
                     <a th:if="${currentUser.admin}" th:href="@{/admin/labs}" class="nav-link">Лабораторные</a>
+                    <a th:unless="${currentUser.admin}" th:href="@{/student/labs}" class="nav-link">Лабораторные</a>
                     <span class="nav-sep" th:text="${currentUser.name}">—</span>
                 </th:block>
                 <button onclick="toggleTheme()" class="btn btn-secondary btn-sm">☀/🌙</button>

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

@@ -4,27 +4,44 @@
 <body>
 <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="${#lists.isEmpty(assignments)}" class="card card-body text-muted">
-        Пока нет назначенных лабораторных. Ожидайте, пока преподаватель распределит варианты.
+    <div class="grid grid-stats">
+        <div class="card card-body"><p class="stat-title">Сдано работ</p>
+            <p class="stat-value" th:text="${submittedCount}">0</p></div>
+        <div class="card card-body"><p class="stat-title">Средний балл</p>
+            <p class="stat-value" th:if="${average != null}" th:text="${average}">—</p>
+            <p class="stat-value text-muted" th:if="${average == null}">—</p></div>
+        <div class="card card-body"><p class="stat-title">Лучшая оценка</p>
+            <p class="stat-value" th:if="${best != null}" th:text="${best.toPlainString()}">—</p>
+            <p class="stat-value text-muted" th:if="${best == null}">—</p></div>
+        <div class="card card-body"><p class="stat-title">Слабое место</p>
+            <p class="stat-value" th:if="${worst != null}" th:text="${worst.toPlainString()}">—</p>
+            <p class="stat-value text-muted" th:if="${worst == null}">—</p></div>
     </div>
 
-    <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 class="flex flex-wrap gap-2 mt-8">
+        <a class="btn btn-primary" th:href="@{/student/labs}">Лабораторные</a>
+        <a class="btn btn-secondary" th:href="@{/learn}">Учебные материалы</a>
+    </div>
+
+    <h2 class="section-title mt-8">Мои лабораторные</h2>
+    <div class="grid grid-2">
+        <div th:each="c : ${cards}" class="card">
+            <div class="card-body">
+                <h3 class="section-title">
+                    <a th:href="@{/student/labs/{id}(id=${c.id})}" th:text="|Лабораторная работа ${c.number}|">ЛР</a>
+                </h3>
+                <p class="text-sm" th:text="${c.title}">—</p>
+                <div class="flex flex-wrap gap-2 mt-2 text-sm">
+                    <span th:if="${c.variantNumber}" class="badge badge-warn">вариант <span class="font-mono" th:text="${c.variantNumber}"></span></span>
+                    <span th:if="${c.submissionSeq}" class="badge badge-ok">сдано (попытка <span th:text="${c.submissionSeq}">1</span>)</span>
+                    <span th:unless="${c.submissionSeq}" class="badge badge-warn">не сдано</span>
+                    <span th:if="${c.grade}" class="badge badge-ok">оценка <span th:text="${c.grade}"></span></span>
                 </div>
             </div>
-            <p class="text-sm text-muted" th:if="${a.variantTitle}" th:text="${a.variantTitle}">—</p>
-            <p class="text-sm text-muted" th:if="${a.deadlineMsk}" th:text="|Срок сдачи: ${a.deadlineMsk} (МСК)|">—</p>
-            <p class="text-sm text-muted" th:if="${a.defenseMsk}" th:text="|Защита: ${a.defenseMsk} (МСК)|">—</p>
-            <div class="md-body mt-4" th:utext="${a.statementHtml}"></div>
         </div>
+        <div th:if="${#lists.isEmpty(cards)}" class="card card-body text-muted">Лабораторных пока нет.</div>
     </div>
 </div>
 </body>
-</html>
+</html>

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

@@ -0,0 +1,61 @@
+<!DOCTYPE html>
+<html lang="ru" xmlns:th="http://www.thymeleaf.org" th:replace="~{fragments/base :: layout(~{::title}, ~{::#content})}">
+<head><title th:text="|ЛР ${lab.number} — LMS|">Лабораторная</title></head>
+<body>
+<div id="content">
+    <a th:href="@{/student/labs}" class="nav-link">← Лабораторные</a>
+    <div class="flex flex-wrap items-center justify-between gap-4 mt-4 mb-2">
+        <h1 class="page-title" th:text="|Лабораторная работа ${lab.number}. ${lab.title}|">ЛР</h1>
+        <div class="flex gap-2 text-sm">
+            <span th:if="${grade != null}" class="badge badge-ok">Оценка: <span th:text="${grade}"></span></span>
+            <span th:if="${assignment != null}" class="badge badge-warn">Вариант <span class="font-mono" th:text="${assignment.variantNumber}"></span></span>
+        </div>
+    </div>
+    <p class="text-sm text-muted mb-6" th:if="${deadlineMsk}">Срок сдачи: <span th:text="${deadlineMsk}"></span> МСК</p>
+
+    <div th:if="${notice}" class="alert alert-success" th:text="${notice}"></div>
+    <div th:if="${error}" class="alert alert-error" th:text="${error}"></div>
+
+    <h2 class="section-title">Условие лабораторной</h2>
+    <div class="card card-body md-body mb-6" th:utext="${descriptionHtml}"></div>
+
+    <th:block th:if="${assignment != null}">
+        <h2 class="section-title">Ваш вариант <span class="font-mono" th:text="${assignment.variantNumber}"></span>
+            <span class="text-muted text-sm" th:if="${assignment.levelTitle}" th:text="|(${assignment.levelTitle})|"></span></h2>
+        <div class="card card-body md-body mb-6" th:utext="${statementHtml}"></div>
+    </th:block>
+    <div th:if="${assignment == null}" class="card card-body mb-6">
+        <p class="text-muted">Ваш вариант ещё не распределён. Дождитесь, пока преподаватель распределит варианты.</p>
+    </div>
+
+    <h2 class="section-title">Сдача работы</h2>
+    <div class="card form-card form-stack mb-4">
+        <form th:action="@{/student/labs/{id}/submit(id=${lab.id})}" method="post" enctype="multipart/form-data" class="form-stack">
+            <input type="hidden" name="_csrf" th:value="${csrfToken}">
+            <p class="text-sm text-muted">zip‑архив или исходники (.c/.h). Пока не истёк срок, можно пересывать столько раз, сколько нужно — засчитывается последняя попытка.</p>
+            <div><input class="input" name="files" type="file" multiple required></div>
+            <div th:if="${canSubmit}">
+                <button class="btn btn-primary" type="submit">Отправить решение</button>
+            </div>
+            <div th:unless="${canSubmit}" class="alert alert-warning">Срок сдачи истёк — отправка закрыта.</div>
+        </form>
+    </div>
+
+    <h3 class="group-title">История сдач</h3>
+    <div class="card card-flush">
+        <table>
+            <thead><tr><th>Попытка</th><th>Когда (МСК)</th><th>Файлы</th><th></th></tr></thead>
+            <tbody>
+            <tr th:each="s : ${submissions}">
+                <td th:text="${s.seq}">1</td>
+                <td class="text-muted" th:text="${#strings.replace(s.createdAt, 'T', ' ')}"></td>
+                <td class="font-mono text-sm"><span th:each="f : ${s.files}" th:text="${f}"></span></td>
+                <td><a class="btn btn-secondary btn-sm" th:href="'/student/submissions/' + ${s.id} + '/download'">Скачать</a></td>
+            </tr>
+            <tr th:if="${#lists.isEmpty(submissions)}"><td colspan="4" class="empty">Вы ещё ничего не сдавали.</td></tr>
+            </tbody>
+        </table>
+    </div>
+</div>
+</body>
+</html>

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

@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html lang="ru" xmlns:th="http://www.thymeleaf.org" th:replace="~{fragments/base :: layout(~{::title}, ~{::#content})}">
+<head><title>Лабораторные — LMS</title></head>
+<body>
+<div id="content">
+    <h1 class="page-title">Лабораторные работы</h1>
+    <div class="grid grid-2">
+        <div th:each="c : ${cards}" class="card">
+            <div class="card-body">
+                <h2 class="section-title">
+                    <a th:href="@{/student/labs/{id}(id=${c.id})}" th:text="|Лабораторная работа ${c.number}. ${c.title}|">ЛР</a>
+                </h2>
+                <div class="flex flex-wrap gap-2 text-sm mt-2">
+                    <span th:if="${c.variantNumber}" class="badge badge-warn">Вариант <span class="font-mono" th:text="${c.variantNumber}"></span></span>
+                    <span th:if="${c.submissionSeq}" class="badge badge-ok">сдано (попытка <span th:text="${c.submissionSeq}"></span>)</span>
+                    <span th:unless="${c.submissionSeq}" class="badge badge-warn">не сдано</span>
+                    <span th:if="${c.grade}" class="badge badge-ok">оценка <span th:text="${c.grade}"></span></span>
+                </div>
+                <p class="text-sm text-muted mt-2" th:if="${c.deadlineMsk}" th:text="|Срок сдачи: ${c.deadlineMsk} МСК|">—</p>
+            </div>
+        </div>
+        <div th:if="${#lists.isEmpty(cards)}" class="card card-body text-muted">Опубликованных лабораторных пока нет.</div>
+    </div>
+</div>
+</body>
+</html>