Volle Mindflux-App ins Deploy-Repo übernehmen

Ersetzt das Hello-World-Gerüst durch die vollständige Anwendung
(com.example.mindflux: 64 Klassen, Thymeleaf-Templates, Static-Assets,
Flyway V1–V6). Deploy-Infrastruktur (.gitea, Dockerfile) bleibt erhalten.

- pom: volle Abhängigkeiten (Security, Thymeleaf, JPA, Flyway), Spring Boot 3.4.4 / Java 17
- docker-compose: SPRING_DATASOURCE_* unverändert; App lauscht auf 8080
  (nginx -> mindflux:8080); Uploads-Volume; Admin-Passwörter via Gitea-Secrets
- Workflow: Deploy-Step injiziert MINDFLUX_ADMIN*_PASSWORD aus Secrets
- .dockerignore ergänzt; Hello-World (com.mindflux) und Test-Datei 'main' entfernt

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/main/resources/templates/admin/techtacular.html

@@ -0,0 +1,96 @@
+<!DOCTYPE html>
+<html lang="de" data-theme="dark"
+      xmlns:th="http://www.thymeleaf.org"
+      xmlns:sec="https://www.thymeleaf.org/thymeleaf-extras-springsecurity6">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>TechTacular-Verwaltung – Admin</title>
+  <link rel="stylesheet" href="/css/theme.css">
+  <script src="/js/theme.js"></script>
+  <style>
+    .ttadmin { max-width: 1000px; margin: 0 auto; padding: 0 1rem; width: 100%; }
+    .ttadmin .new-cat { margin-bottom: 1.6rem; }
+    .ttadmin .cat {
+      display: flex; align-items: center; flex-wrap: wrap; gap: 0.6rem;
+      justify-content: space-between;
+      background: var(--surface);
+      border: 1px solid var(--border);
+      border-left: 4px solid var(--accent);
+      border-radius: 12px; padding: 0.9rem 1.1rem; margin-bottom: 0.7rem;
+      box-shadow: var(--g-soft);
+    }
+    .ttadmin .cat.inactive { border-left-color: var(--danger); opacity: 0.7; }
+    .ttadmin .cat h2 { color: var(--heading); margin: 0; font-size: 1.1rem; }
+    .ttadmin .slug { color: var(--accent); font-size: 0.78rem; font-family: monospace; }
+    .ttadmin .count { color: var(--muted); font-size: 0.85rem; }
+    .ttadmin .badge { font-size: 0.68rem; text-transform: uppercase; padding: 0.14rem 0.45rem; border-radius: 7px; border: 1px solid var(--border-accent); }
+    .ttadmin .badge.on { background: var(--glow-w); color: var(--accent); }
+    .ttadmin .badge.off { background: rgba(255,95,107,.12); color: var(--danger); border-color: var(--danger); }
+    .ttadmin .actions { display: flex; gap: 0.45rem; flex-wrap: wrap; align-items: center; }
+    .ttadmin form.inline { display: flex; gap: 0.5rem; flex-wrap: wrap; align-items: center; }
+    .ttadmin .empty { color: var(--muted); }
+  </style>
+</head>
+<body>
+
+<div class="mf-theme-float"><button class="mf-theme"></button></div>
+
+<div class="mf-container" style="max-width:1040px">
+
+  <div class="mf-page-head">
+    <a th:href="@{/admin}" class="mf-back">⟵ Zurück zum Admin-Dashboard</a>
+  </div>
+
+  <header style="margin-bottom:1.4rem">
+    <div class="mf-eyebrow">TechTacular</div>
+    <h1 style="color:var(--heading); font-size:1.75rem; font-weight:800; margin-top:.35rem">🎯 TechTacular-Verwaltung</h1>
+  </header>
+
+  <main class="ttadmin">
+
+    <div class="mf-panel accent new-cat">
+      <h4>Neue Kategorie anlegen</h4>
+      <form class="inline" th:action="@{/admin/techtacular/categories}" method="post">
+        <input class="mf-input" style="width:auto; min-width:240px" type="text" name="title" placeholder="z. B. Datenbanken" required>
+        <button type="submit" class="mf-btn">➕ Kategorie anlegen</button>
+      </form>
+    </div>
+
+    <div class="cat" th:each="cat : ${categories}" th:classappend="${cat.active} ? '' : 'inactive'">
+      <div>
+        <h2 th:text="${cat.title}">Kategorie</h2>
+        <span class="slug" th:text="'/' + ${cat.slug}">/slug</span>
+        <span class="badge on"  th:if="${cat.active}">aktiv</span>
+        <span class="badge off" th:unless="${cat.active}">inaktiv</span>
+        <span class="count" th:text="'· ' + ${cat.questionCount} + ' Fragen'">· 0 Fragen</span>
+      </div>
+      <div class="actions">
+        <a class="mf-btn" th:href="@{'/admin/techtacular/categories/' + ${cat.id}}">Fragen verwalten</a>
+        <form th:action="@{'/admin/techtacular/categories/' + ${cat.id} + '/toggle'}" method="post">
+          <button type="submit" class="mf-btn outline" th:text="${cat.active} ? 'Deaktivieren' : 'Aktivieren'">Toggle</button>
+        </form>
+        <form th:action="@{'/admin/techtacular/categories/' + ${cat.id} + '/delete'}" method="post"
+              onsubmit="return confirm('Kategorie inkl. aller Fragen löschen?');">
+          <button type="submit" class="mf-btn danger">Löschen</button>
+        </form>
+      </div>
+    </div>
+
+    <p th:if="${categories.isEmpty()}" class="empty">Noch keine Kategorien. Lege oben die erste an.</p>
+
+  </main>
+
+</div>
+
+<footer class="mf-footer">
+  <a href="#">Support</a>
+  <a href="#">Feedback</a>
+  <a href="#">Nutzungsbedingungen</a>
+  <a href="#">Richtlinien</a>
+  <a href="#">Datenschutz</a>
+  <a href="#">Impressum</a>
+</footer>
+
+</body>
+</html>