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>

admin-v2/app/api/admin/companion/route.ts

@@ -0,0 +1,102 @@
+import { NextResponse } from 'next/server'
+
+/**
+ * GET /api/admin/companion
+ * Proxy to backend /api/state/dashboard for companion dashboard data
+ */
+export async function GET() {
+  try {
+    const backendUrl = process.env.BACKEND_URL || 'http://localhost:8000'
+
+    // TODO: Replace with actual backend call when endpoint is available
+    // const response = await fetch(`${backendUrl}/api/state/dashboard`, {
+    //   method: 'GET',
+    //   headers: {
+    //     'Content-Type': 'application/json',
+    //   },
+    // })
+    //
+    // if (!response.ok) {
+    //   throw new Error(`Backend responded with ${response.status}`)
+    // }
+    //
+    // const data = await response.json()
+    // return NextResponse.json(data)
+
+    // Mock response for development
+    const mockData = {
+      success: true,
+      data: {
+        context: {
+          currentPhase: 'erarbeitung',
+          phaseDisplayName: 'Erarbeitung',
+        },
+        stats: {
+          classesCount: 4,
+          studentsCount: 96,
+          learningUnitsCreated: 23,
+          gradesEntered: 156,
+        },
+        phases: [
+          { id: 'einstieg', shortName: 'E', displayName: 'Einstieg', duration: 8, status: 'completed', color: '#4A90E2' },
+          { id: 'erarbeitung', shortName: 'A', displayName: 'Erarbeitung', duration: 20, status: 'active', color: '#F5A623' },
+          { id: 'sicherung', shortName: 'S', displayName: 'Sicherung', duration: 10, status: 'planned', color: '#7ED321' },
+          { id: 'transfer', shortName: 'T', displayName: 'Transfer', duration: 7, status: 'planned', color: '#9013FE' },
+          { id: 'reflexion', shortName: 'R', displayName: 'Reflexion', duration: 5, status: 'planned', color: '#6B7280' },
+        ],
+        progress: {
+          percentage: 65,
+          completed: 13,
+          total: 20,
+        },
+        suggestions: [
+          {
+            id: '1',
+            title: 'Klausuren korrigieren',
+            description: 'Deutsch LK - 12 unkorrigierte Arbeiten warten',
+            priority: 'urgent',
+            icon: 'ClipboardCheck',
+            actionTarget: '/ai/klausur-korrektur',
+            estimatedTime: 120,
+          },
+          {
+            id: '2',
+            title: 'Elternsprechtag vorbereiten',
+            description: 'Notenuebersicht fuer 8b erstellen',
+            priority: 'high',
+            icon: 'Users',
+            actionTarget: '/education/grades',
+            estimatedTime: 30,
+          },
+        ],
+        upcomingEvents: [
+          {
+            id: 'e1',
+            title: 'Mathe-Test 9b',
+            date: new Date(Date.now() + 2 * 24 * 60 * 60 * 1000).toISOString(),
+            type: 'exam',
+            inDays: 2,
+          },
+          {
+            id: 'e2',
+            title: 'Elternsprechtag',
+            date: new Date(Date.now() + 5 * 24 * 60 * 60 * 1000).toISOString(),
+            type: 'parent_meeting',
+            inDays: 5,
+          },
+        ],
+      },
+    }
+
+    return NextResponse.json(mockData)
+  } catch (error) {
+    console.error('Companion dashboard error:', error)
+    return NextResponse.json(
+      {
+        success: false,
+        error: error instanceof Error ? error.message : 'Unknown error',
+      },
+      { status: 500 }
+    )
+  }
+}