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>

klausur-service/backend/config.py

@@ -0,0 +1,51 @@
+"""
+Klausur-Service Configuration
+
+Centralized configuration for all environment variables and constants.
+"""
+
+import os
+
+# =============================================
+# JWT & Authentication
+# =============================================
+JWT_SECRET = os.getenv("JWT_SECRET", "your-super-secret-jwt-key-change-in-production")
+
+# =============================================
+# Service URLs
+# =============================================
+BACKEND_URL = os.getenv("BACKEND_URL", "http://backend:8000")
+SCHOOL_SERVICE_URL = os.getenv("SCHOOL_SERVICE_URL", "http://school-service:8084")
+ENVIRONMENT = os.getenv("ENVIRONMENT", "development")
+
+# =============================================
+# BYOEH Configuration
+# =============================================
+QDRANT_URL = os.getenv("QDRANT_URL", "http://localhost:6333")
+OPENAI_API_KEY = os.getenv("OPENAI_API_KEY", "")
+BYOEH_ENCRYPTION_ENABLED = os.getenv("BYOEH_ENCRYPTION_ENABLED", "true").lower() == "true"
+
+# =============================================
+# File Storage Paths
+# =============================================
+_BASE_DIR = os.path.dirname(os.path.abspath(__file__))
+EH_UPLOAD_DIR = os.getenv("EH_UPLOAD_DIR", os.path.join(_BASE_DIR, "eh-uploads"))
+UPLOAD_DIR = os.getenv("UPLOAD_DIR", os.path.join(_BASE_DIR, "uploads"))
+FRONTEND_PATH = os.getenv("FRONTEND_PATH", os.path.join(_BASE_DIR, "frontend", "dist"))
+
+# =============================================
+# Rights Confirmation Text (German)
+# =============================================
+RIGHTS_CONFIRMATION_TEXT = """Ich bestaetige hiermit, dass:
+
+1. Ich das Urheberrecht oder die notwendigen Nutzungsrechte an diesem
+   Erwartungshorizont besitze.
+
+2. Breakpilot diesen Erwartungshorizont NICHT fuer KI-Training verwendet,
+   sondern ausschliesslich fuer RAG-gestuetzte Korrekturvorschlaege
+   in meinem persoenlichen Arbeitsbereich.
+
+3. Der Inhalt verschluesselt gespeichert wird und Breakpilot-Mitarbeiter
+   keinen Zugriff auf den Klartext haben.
+
+4. Ich diesen Erwartungshorizont jederzeit loeschen kann."""