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/classroom/routes/__init__.py

@@ -0,0 +1,29 @@
+"""
+Classroom Routes Package
+
+Exports all route modules for the Classroom API.
+"""
+
+from .sessions import router as sessions_router
+from .templates import router as templates_router
+from .homework import router as homework_router
+from .materials import router as materials_router
+from .analytics import router as analytics_router
+from .export import router as export_router
+from .feedback import router as feedback_router
+from .settings import router as settings_router
+from .context import router as context_router
+from .websocket_routes import router as websocket_router
+
+__all__ = [
+    "sessions_router",
+    "templates_router",
+    "homework_router",
+    "materials_router",
+    "analytics_router",
+    "export_router",
+    "feedback_router",
+    "settings_router",
+    "context_router",
+    "websocket_router",
+]