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>

docker-compose.staging.yml

@@ -0,0 +1,133 @@
+# ============================================
+# BreakPilot PWA - Staging Overrides
+# ============================================
+# Usage: docker compose -f docker-compose.yml -f docker-compose.staging.yml up -d
+#
+# Or use the helper script:
+#   ./scripts/start.sh staging
+# ============================================
+
+services:
+  # ==========================================
+  # Python Backend (FastAPI)
+  # ==========================================
+  backend:
+    environment:
+      - DEBUG=false
+      - ENVIRONMENT=staging
+      - LOG_LEVEL=info
+    restart: unless-stopped
+    # No hot-reload in staging
+    command: uvicorn main:app --host 0.0.0.0 --port 8000
+
+  # ==========================================
+  # Go Consent Service
+  # ==========================================
+  consent-service:
+    environment:
+      - GIN_MODE=release
+      - ENVIRONMENT=staging
+      - LOG_LEVEL=info
+    restart: unless-stopped
+
+  # ==========================================
+  # Go School Service
+  # ==========================================
+  school-service:
+    environment:
+      - GIN_MODE=release
+      - ENVIRONMENT=staging
+    restart: unless-stopped
+
+  # ==========================================
+  # Go Billing Service
+  # ==========================================
+  billing-service:
+    environment:
+      - GIN_MODE=release
+      - ENVIRONMENT=staging
+    restart: unless-stopped
+
+  # ==========================================
+  # Klausur Service (Python + React)
+  # ==========================================
+  klausur-service:
+    environment:
+      - DEBUG=false
+      - ENVIRONMENT=staging
+    restart: unless-stopped
+
+  # ==========================================
+  # Website (Next.js)
+  # ==========================================
+  website:
+    environment:
+      - NODE_ENV=production
+    restart: unless-stopped
+
+  # ==========================================
+  # PostgreSQL (Separate Database for Staging)
+  # ==========================================
+  postgres:
+    ports:
+      - "5433:5432"  # Different port for staging!
+    environment:
+      - POSTGRES_DB=${POSTGRES_DB:-breakpilot_staging}
+    volumes:
+      - breakpilot_staging_postgres:/var/lib/postgresql/data
+
+  # ==========================================
+  # MinIO (Object Storage - Different Ports)
+  # ==========================================
+  minio:
+    ports:
+      - "9002:9000"
+      - "9003:9001"
+    volumes:
+      - breakpilot_staging_minio:/data
+
+  # ==========================================
+  # Qdrant (Vector DB - Different Ports)
+  # ==========================================
+  qdrant:
+    ports:
+      - "6335:6333"
+      - "6336:6334"
+    volumes:
+      - breakpilot_staging_qdrant:/qdrant/storage
+
+  # ==========================================
+  # Mailpit (Still using Mailpit for Safety)
+  # ==========================================
+  mailpit:
+    ports:
+      - "8026:8025"  # Different Web UI port
+      - "1026:1025"  # Different SMTP port
+
+  # ==========================================
+  # DSMS Gateway
+  # ==========================================
+  dsms-gateway:
+    environment:
+      - DEBUG=false
+      - ENVIRONMENT=staging
+    restart: unless-stopped
+
+  # ==========================================
+  # Enable Backup Service in Staging
+  # ==========================================
+  backup:
+    profiles: []  # Remove profile restriction = always start
+    environment:
+      - PGDATABASE=breakpilot_staging
+
+# ==========================================
+# Separate Volumes for Staging
+# ==========================================
+volumes:
+  breakpilot_staging_postgres:
+    name: breakpilot_staging_postgres
+  breakpilot_staging_minio:
+    name: breakpilot_staging_minio
+  breakpilot_staging_qdrant:
+    name: breakpilot_staging_qdrant