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/modules/__init__.py

@@ -0,0 +1,55 @@
+"""
+BreakPilot Studio - Modulare Frontend-Architektur
+
+Jedes Modul stellt HTML, CSS und JavaScript fuer einen bestimmten Funktionsbereich bereit.
+Die Module werden dynamisch in das Base-Layout geladen.
+
+Module:
+- base: TopBar, Sidebar, Footer, Theme Toggle, Login
+- jitsi: Videokonferenz-Modul (Elterngespraeche, Schulungen, Klassenkonferenzen)
+- letters: Elternbriefe mit rechtssicherer Sprache und Legal Assistant
+- worksheets: Lerneinheiten und Arbeitsblaetter
+- correction: Klausurkorrektur mit OCR
+- messenger: Matrix Messenger Integration
+- school: Schulverwaltung (Klassen, Klausuren, Noten, Klassenbuch, Zeugnisse)
+- content_creator: Content Creator fuer Lehrer (H5P Integration, CC Lizenzen)
+- content_feed: Content Feed fuer Content Discovery und Rating
+"""
+
+from .base import BaseLayoutModule
+from .dashboard import DashboardModule
+from .jitsi import JitsiModule
+from .letters import LettersModule
+from .worksheets import WorksheetsModule
+from .correction import CorrectionModule
+from .messenger import MessengerModule
+from .school import SchoolModule
+from .content_creator import ContentCreatorModule
+from .content_feed import ContentFeedModule
+from .gradebook import GradebookModule
+from .companion import CompanionModule
+from .klausur_korrektur import KlausurKorrekturModule
+from .abitur_docs_admin import AbiturDocsAdminModule
+from .rbac_admin import RbacAdminModule
+from .security import SecurityModule
+from .mail_inbox import MailInboxModule
+
+__all__ = [
+    'BaseLayoutModule',
+    'DashboardModule',
+    'JitsiModule',
+    'LettersModule',
+    'WorksheetsModule',
+    'CorrectionModule',
+    'MessengerModule',
+    'SchoolModule',
+    'ContentCreatorModule',
+    'ContentFeedModule',
+    'GradebookModule',
+    'CompanionModule',
+    'KlausurKorrekturModule',
+    'AbiturDocsAdminModule',
+    'RbacAdminModule',
+    'SecurityModule',
+    'MailInboxModule',
+]