fix: Restore all files lost during destructive rebase

A previous `git pull --rebase origin main` dropped 177 local commits,
losing 3400+ files across admin-v2, backend, studio-v2, website,
klausur-service, and many other services. The partial restore attempt
(660295e2) only recovered some files.

This commit restores all missing files from pre-rebase ref 98933f5e
while preserving post-rebase additions (night-scheduler, night-mode UI,
NightModeWidget dashboard integration).

Restored features include:
- AI Module Sidebar (FAB), OCR Labeling, OCR Compare
- GPU Dashboard, RAG Pipeline, Magic Help
- Klausur-Korrektur (8 files), Abitur-Archiv (5+ files)
- Companion, Zeugnisse-Crawler, Screen Flow
- Full backend, studio-v2, website, klausur-service
- All compliance SDKs, agent-core, voice-service
- CI/CD configs, documentation, scripts

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/frontend/meetings/pages/active.py

@@ -0,0 +1,76 @@
+"""
+Meetings Module - Active Meetings Page
+List of currently active meetings
+"""
+
+from ..templates import ICONS, render_base_page
+
+
+def active_meetings() -> str:
+    """Active meetings list"""
+    content = f'''
+    <div class="page-header">
+      <div>
+        <h1 class="page-title">Aktive Meetings</h1>
+        <p class="page-subtitle">Laufende Videokonferenzen und Schulungen</p>
+      </div>
+      <button class="btn btn-primary" onclick="window.location.href='/meetings/quick'">
+        {ICONS['plus']} Neues Meeting starten
+      </button>
+    </div>
+
+    <!-- Active Meetings List -->
+    <div class="meeting-list" id="activeMeetingsList">
+      <div style="text-align: center; padding: 3rem; color: var(--bp-text-muted);">
+        <p>Keine aktiven Meetings</p>
+        <p style="font-size: 0.875rem; margin-top: 0.5rem;">
+          Starten Sie ein neues Meeting oder warten Sie, bis ein geplantes Meeting beginnt.
+        </p>
+      </div>
+    </div>
+
+    <script>
+      async function loadActiveMeetings() {{
+        try {{
+          const response = await fetch('/api/meetings/active');
+          if (response.ok) {{
+            const meetings = await response.json();
+            renderMeetings(meetings);
+          }}
+        }} catch (error) {{
+          console.error('Error loading active meetings:', error);
+        }}
+      }}
+
+      function renderMeetings(meetings) {{
+        const container = document.getElementById('activeMeetingsList');
+
+        if (!meetings || meetings.length === 0) {{
+          return;
+        }}
+
+        container.innerHTML = meetings.map(meeting => `
+          <div class="meeting-item">
+            <div class="meeting-time">
+              <div class="meeting-time-value">${{meeting.participants || 0}}</div>
+              <div class="meeting-time-date">Teilnehmer</div>
+            </div>
+            <div class="meeting-info">
+              <div class="meeting-title">${{meeting.title}}</div>
+              <div class="meeting-meta">
+                <span>{ICONS['clock']} Seit ${{meeting.started_at}}</span>
+              </div>
+            </div>
+            <span class="meeting-badge badge-live">LIVE</span>
+            <div class="meeting-actions">
+              <button class="btn btn-primary" onclick="window.location.href='/meetings/room/${{meeting.room_name}}'">Beitreten</button>
+            </div>
+          </div>
+        `).join('');
+      }}
+
+      loadActiveMeetings();
+    </script>
+    '''
+
+    return render_base_page("Aktive Meetings", content, "active")