Initial commit: LMS microservices scaffold

- Gradle multi-module: libs/{common-http,security-jwt,markdown,test-support},
  services/{identity,academic,progress,gateway}, web (Thymeleaf+htmx)
- identity-service: JWT auth (RSA), accounts, students, groups, enrollment,
  import from XLSX/CSV, credentials export, password reset
- academic-service: lab import from JSON/zip (markdown + YAML + variants),
  levels, API
- progress-service: schema for student levels and variant assignments
- gateway: Spring Cloud Gateway, JWT validation, route propagation
- web: Server-side UI with flex/footer layout, light/dark theme toggle,
  admin dashboard, groups CRUD, student portal placeholder
- docker-compose: PostgreSQL 18
- Tests: identity smoke test with Testcontainers

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

@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html lang="ru" xmlns:th="http://www.thymeleaf.org" th:fragment="layout(title, content)">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <title th:replace="${title}">LMS</title>
+    <link rel="stylesheet" th:href="@{/css/app.css}">
+    <script th:src="@{/js/htmx.min.js}" defer></script>
+    <script>
+        (function(){
+            var t = localStorage.getItem('lms-theme') || 'light';
+            document.documentElement.setAttribute('data-theme', t);
+        })();
+        function toggleTheme() {
+            var e = document.documentElement;
+            var t = e.getAttribute('data-theme') === 'dark' ? 'light' : 'dark';
+            e.setAttribute('data-theme', t);
+            localStorage.setItem('lms-theme', t);
+        }
+    </script>
+</head>
+<body class="flex flex-col" style="min-height:100vh">
+<header style="position:sticky;top:0;z-index:10;border-bottom:1px solid var(--c-border);background:var(--c-surface);">
+    <div style="max-width:1152px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:0.75rem 1.5rem;">
+        <a th:href="@{/}" style="font-size:1.125rem;font-weight:600;text-decoration:none;">LMS</a>
+        <nav style="display:flex;align-items:center;gap:1rem;font-size:0.875rem;" th:if="${currentUser != null}">
+            <a th:if="${currentUser.admin}" th:href="@{/admin}">Панель</a>
+            <a th:if="${currentUser.admin}" th:href="@{/admin/groups}">Группы</a>
+            <span style="color:var(--c-text-muted)" th:text="${currentUser.name}">—</span>
+            <button onclick="toggleTheme()" class="btn btn-secondary" style="padding:0.25rem 0.5rem;font-size:0.75rem;">☀/🌙</button>
+            <form th:action="@{/logout}" method="post">
+                <button class="btn btn-secondary" type="submit">Выйти</button>
+            </form>
+        </nav>
+    </div>
+</header>
+<main style="flex:1;width:100%;max-width:1152px;margin:0 auto;padding:2rem 1.5rem;">
+    <th:block th:replace="${content}" />
+</main>
+<footer style="border-top:1px solid var(--c-border);padding:1rem;text-align:center;font-size:0.75rem;color:var(--c-text-muted);">
+    LMS v0.1.1
+</footer>
+</body>
+</html>