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>

studio-v2/app/api/recordings/route.ts

@@ -0,0 +1,34 @@
+import { NextRequest, NextResponse } from 'next/server'
+
+/**
+ * Proxy for /api/recordings base endpoint
+ */
+
+const BACKEND_URL = process.env.BACKEND_URL || 'http://localhost:8000'
+
+export async function GET(request: NextRequest) {
+  const url = `${BACKEND_URL}/api/recordings`
+
+  try {
+    const response = await fetch(url, {
+      method: 'GET',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+    })
+
+    const data = await response.text()
+    return new NextResponse(data, {
+      status: response.status,
+      headers: {
+        'Content-Type': response.headers.get('content-type') || 'application/json',
+      },
+    })
+  } catch (error) {
+    console.error(`Failed to proxy GET ${url}:`, error)
+    return NextResponse.json(
+      { error: 'Backend nicht erreichbar', details: error instanceof Error ? error.message : 'Unknown error' },
+      { status: 502 }
+    )
+  }
+}