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/.git-hooks/setup.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+#
+# Setup git hooks for studio-v2
+#
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+
+echo "Setting up git hooks for studio-v2..."
+
+# Make hooks executable
+chmod +x "$SCRIPT_DIR/pre-push"
+
+# Configure git to use custom hooks directory
+git config core.hooksPath .git-hooks
+
+echo "Git hooks installed successfully!"
+echo ""
+echo "Hooks enabled:"
+echo "  - pre-push: Runs E2E tests before pushing"
+echo ""
+echo "To disable hooks temporarily: git push --no-verify"